Administrivia:

  - Added Ruby 3.0 to the CI test matrix. Added `windows/jruby` to the
    CI exclusion list; it refuses to run successfully.
  - Update History.md and Contributing.md documentation with the most
    recent updates in a `NEXT` release (there are no changes as of yet
    that require a new release).

3 files changed, 56 insertions, 28 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7c83bf6..4be556e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,6 +26,7 @@ jobs:
           - 2.5
           - 2.6
           - 2.7
+          - 3.0
           - head
           - debug
           - mingw
@@ -46,6 +47,10 @@ jobs:
           - os: windows
             ruby: debug
           - os: windows
+            ruby: jruby
+          - os: windows
+            ruby: jruby-head
+          - os: windows
             ruby: truffleruby
           - os: windows
             ruby: truffleruby-head
diff --git a/Contributing.md b/Contributing.md
index 405c09b..56d4df5 100644
--- a/Contributing.md
+++ b/Contributing.md
@@ -6,11 +6,11 @@ request, or code contributions.
 There are a few guidelines for contributing to mime-types:
 
 - Code changes _will_ _not_ be accepted without tests. The test suite is
-  written with [minitest][].
+  written with [minitest].
 - Match my coding style.
 - Use a thoughtfully-named topic branch that contains your change. Rebase your
   commits into logical chunks as necessary.
-- Use [quality commit messages][].
+- Use [quality commit messages].
 - Do not change the version number; when your patch is accepted and a release
   is made, the version will be updated at that point.
 - Submit a GitHub pull request with your changes.
@@ -19,11 +19,11 @@ There are a few guidelines for contributing to mime-types:
 ## Adding or Modifying MIME Types
 
 The mime-types registry is no longer contained in mime-types, but in
-[mime-types-data][]. Please see that project for contributions there.
+[mime-types-data]. Please see that project for contributions there.
 
 ### Test Dependencies
 
-mime-types uses Ryan Davis’s [Hoe][] to manage the release process, and it adds
+mime-types uses Ryan Davis’s [Hoe] to manage the release process, and it adds
 a number of rake tasks. You will mostly be interested in `rake`, which runs
 the tests the same way that `rake test` or `rake travis` will do.
 
@@ -52,7 +52,7 @@ built-in benchmark library:
 
 There are two allocation tracing benchmarks (for normal and columnar loads).
 These can only be run on Ruby 2.1 or better and requires the
-[allocation\_tracer][] gem (not installed by default).
+[allocation\_tracer] gem (not installed by default).
 
 - `rake benchmark:allocations`
 - `rake benchmark:allocations:columnar`
@@ -101,6 +101,7 @@ Thanks to everyone else who has contributed to mime-types over the years:
 - Greg Brockman
 - Hans de Graaff
 - Henrik Hodne
+- Igor Victor
 - Janko Marohnić
 - Jean Boussier
 - Jeremy Evans
@@ -109,6 +110,8 @@ Thanks to everyone else who has contributed to mime-types over the years:
 - Łukasz Śliwa
 - Keerthi Siva
 - Ken Ip
+- Kevin Menard
+- Koichi ITO
 - Martin d'Allens
 - Mauricio Linhares
 - Nicolas Leger
diff --git a/History.md b/History.md
index ca8ef20..cde0aa4 100644
--- a/History.md
+++ b/History.md
@@ -1,5 +1,21 @@
 # Changelog
 
+## NEXT / 2021-MM-DD
+
+- Documentation:
+
+  - Kevin Menard synced the documentation so that all examples are correct
+    [#153].
+
+- Administrivia:
+
+  - Added Ruby 3.0 to the CI test matrix. Added `windows/jruby` to the
+    CI exclusion list; it refuses to run successfully.
+  - Removed the Travis CI configuration and changed it to Github Workflows
+    [#150]. Removed Coveralls configuration.
+  - Igor Victor added TruffleRuby to the Travis CI configuration [#149].
+  - Koichi ITO loosened an excessively tight dependency [#147].
+
 ## 3.3.1 / 2019-12-26
 
 - 1 minor bugfix:
@@ -8,12 +24,12 @@
     because Ruby 2.7 introduces numbered block parameters. Because of the way
     that the MIME::Types::Logger works for deprecation messages, the
     initializer parameters had been named `_1`, `_2`, and `_3`. This has now
-    been resolved. [#146][]
+    been resolved. [#146]
 
 - Administrivia:
 
   - Olle Jonsson removed an outdated Travis configuration option (`sudo:
-    false`). [#142][]
+    false`). [#142]
 
 ## 3.3 / 2019-09-04
 
@@ -22,16 +38,16 @@
   - Jean Boussier reduced memory usage for Ruby versions 2.3 or higher by
     interning various string values in each type. This is done with a
     backwards-compatible call that _freezes_ the strings on older versions of
-    Ruby. [#141][]
+    Ruby. [#141]
 
 - Administrivia:
 
-  - Nicholas La Roux updated Travis build configurations. [#139][]
+  - Nicholas La Roux updated Travis build configurations. [#139]
 
 ## 3.2.2 / 2018-08-12
 
 - Hiroto Fukui removed a stray `debugger` statement that I had used in
-  producing v3.2.1. [#137][]
+  producing v3.2.1. [#137]
 
 ## 3.2.1 / 2018-08-12
 
@@ -46,22 +62,22 @@
   - Janko Marohnić contributed a change to `MIME::Type#priority_order` that
     should improve on strict sorting when dealing with MIME types that appear
     to be in the same family even if strict sorting would cause an
-    unregistered type to be sorted first. [#132][]
+    unregistered type to be sorted first. [#132]
 
   - Dillon Welch contributed a change that added `frozen_string_literal:
     true` to files so that modern Rubies can automatically reduce duplicate
-    string allocations. [#135][]
+    string allocations. [#135]
 
 - 2 bug fixes
 
-  - Burke Libbey fixed a problem with cached data loading. [#126][]
+  - Burke Libbey fixed a problem with cached data loading. [#126]
 
   - Resolved an issue where Enumerable#inject returns `nil` when provided an
     empty enumerable and a default value has not been provided. This is
     because when Enumerable#inject isn't provided a starting value, the first
     value is used as the default value. In every case where this error was
     happening, the result was supposed to be an array containing Set objects
-    so they can be reduced to a single Set. [#117][], [#127][], [#134][].
+    so they can be reduced to a single Set. [#117], [#127], [#134].
 
   - Fixed an uncontrolled growth bug in MIME::Types::Container where a key
     miss would create a new entry with an empty Set in the container. This
@@ -70,7 +86,7 @@
     did not have any way of determining the difference between construction
     and querying. This would mean that, if you have a function in your web
     app that queries the MIME::Types registry by extension, the extension
-    registry would grow uncontrollably. [#136][]
+    registry would grow uncontrollably. [#136]
 
 - Deprecations:
 
@@ -83,12 +99,12 @@
   - The history file has been modified to remove all history prior to 3.0.
     This history can be found in previous commits.
 
-  - A spelling error was corrected by Edward Betts ([#129][]).
+  - A spelling error was corrected by Edward Betts ([#129]).
 
 - Administrivia:
 
   - CI configuration for more modern versions of Ruby were added by Nicolas
-    Leger ([#130][]), Jun Aruga ([#125][]), and Austin Ziegler. Removed
+    Leger ([#130]), Jun Aruga ([#125]), and Austin Ziegler. Removed
     ruby-head-clang and rbx (Rubinius) from CI.
 
   - Fixed tests which were asserting equality against nil, which will become
@@ -99,18 +115,18 @@
 - 1 documentation change:
 
   - Tim Smith (@tas50) updated the build badges to be SVGs to improve
-    readability on high-density (retina) screens with pull request [#112][].
+    readability on high-density (retina) screens with pull request [#112].
 
 - 3 bug fixes
 
   - A test for `MIME::Types::Cache` fails under Ruby 2.3 because of frozen
-    strings, [#118][]. This has been fixed.
+    strings, [#118]. This has been fixed.
 
   - The JSON data has been incorrectly encoded since the release of
     mime-types 3 on the `xrefs` field, because of the switch to using a Set
     to store cross-reference information. This has been fixed.
 
-  - A tentative fix for [#117][] has been applied, removing the only circular
+  - A tentative fix for [#117] has been applied, removing the only circular
     require dependencies that exist (and for which there was code to prevent,
     but the current fix is simpler). I have no way to verify this fix and
     depending on how things are loaded by `delayed_job`, this fix may not be
@@ -125,22 +141,22 @@
 - 2 governance changes
 
   - This project and the related mime-types-data project are now exclusively
-    MIT licensed. Resolves [#95][].
+    MIT licensed. Resolves [#95].
 
   - All projects under the mime-types organization now have a standard code
-    of conduct adapted from the [Contributor Covenant][]. This text can be
-    found in the [Code-of-Conduct.md][] file.
+    of conduct adapted from the [Contributor Covenant]. This text can be
+    found in the [Code-of-Conduct.md] file.
 
 - 3 major changes
 
   - All methods deprecated in mime-types 2.x have been removed.
 
   - mime-types now requires Ruby 2.0 compatibility or later. Resolves
-    [#97][].
+    [#97].
 
   - The registry data has been removed from mime-types and put into
     mime-types-data, maintained and released separately. It can be found at
-    [mime-types-data][].
+    [mime-types-data].
 
 - 17 minor changes:
 
@@ -164,7 +180,7 @@
 
     - When extensions are set or modified with `add_extensions`, the primary
       registry will be informed of a need to reindex extensions. Resolves
-      [#84][].
+      [#84].
 
     - The preferred extension can be set explicitly. If not set, it will be
       the first extension. If the preferred extension is not in the extension
@@ -187,7 +203,7 @@
     - Extracted the class methods to a separate file.
 
     - Changed the container implementation to use a Set instead of an Array
-      to prevent data duplication. Resolves [#79][].
+      to prevent data duplication. Resolves [#79].
 
   - `MIME::Types::Cache` changes:
 
@@ -206,7 +222,7 @@
 
     - The registry is default loaded from the columnar store by default. The
       internal format of the columnar store has changed; many of the boolean
-      flags are now loaded from a single file. Resolves [#85][].
+      flags are now loaded from a single file. Resolves [#85].
 
 [#79]: https://github.com/mime-types/ruby-mime-types/pull/79
 [#84]: https://github.com/mime-types/ruby-mime-types/pull/84
@@ -231,6 +247,10 @@
 [#141]: https://github.com/mime-types/ruby-mime-types/pull/141
 [#142]: https://github.com/mime-types/ruby-mime-types/pull/142
 [#146]: https://github.com/mime-types/ruby-mime-types/pull/146
+[#147]: https://github.com/mime-types/ruby-mime-types/pull/147
+[#149]: https://github.com/mime-types/ruby-mime-types/pull/149
+[#150]: https://github.com/mime-types/ruby-mime-types/pull/150
+[#153]: https://github.com/mime-types/ruby-mime-types/pull/153
 [code-of-conduct.md]: Code-of-Conduct_md.html
 [contributor covenant]: http://contributor-covenant.org
 [mime-types-data]: https://github.com/mime-types/mime-types-data