dict literals are idiomatic and Pythonic patterns that utilize modern
syntax. A dict literal is always slightly faster than a call to dict().

$ python3 -m timeit 'dict(a=1, b=2, c=3)'
10000000 loops, best of 3: 0.187 usec per loop
$ python3 -m timeit '{"a": 1, "b": 2, "c": 3}'
10000000 loops, best of 3: 0.0705 usec per loop

RECORD should always be read and written as UTF-8.
Fixes #207.

This was a thing in the now-withdrawn PEP 426.
Fixes #195.

Updated metadata version to 2.1 and dropped DESCRIPTION.rst from the list of created files.

Parenthesize markers before adding the `and extra == "..."` clause
so it does not break the logic of the preceding expression when
`or` operands are used.

Fixes #208.

This was introduced by setuptools 36.4.0 and was causing a test failure
in this project.