This should help provide better motivating use cases. Examples inspired by https://glyph.twistedmatrix.com/2021/03/interfaces-and-protocols.html

Also some minor typo fixes and updates to comments.

Let subclasses of BaseAdapterRegistry customize the data structures.

Also tweak docs.

Add extensive tests for this. Fixes #224.

Also adds test for, and fixes #227

Add BAR.rebuild() to fix the refcount issue, and to change datatypes.

It works by using the new methods allRegistrations() and allSubscriptions() to re-create the data in new data structures.

This makes fresh calls to subscribe() and register(). I went this way instead of trying to manually walk the data structures and create them because the logic in those methods is fully tested.

First pass at github actions.

See https://github.com/pypa/manylinux/issues/428

Fixes #225. Someone will need to add a `TWINE_PASSWORD` GitHub repository secret that is
a token for `zope.eggbuilder` to upload to zope.interface.

Builds and uploads manylinux32/64/aarch64 wheels.

Builds and uploads Mac wheels.

Builds the docs.

Runs tests with the C extension and without the C extension.

Reports coverage to coveralls.

Has the start of an environment to do linting.

Removes .travis.yml