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* Add support for ``assertDictContainsSubset``.
* Put parenthesis around expressions if required.
* Fixed assertRaisesRegex, assertRaisesRegexp and assertWarnsRegex.
The regex was getting replaced with an undefined variable `pattern`.
* Fix assertRaisesRegex and assertRaisesRegexp with `**kwargs` and
`atom` parameters.
* Made assertRaisesRegex, assertRaisesRegexp and assertWarnsRegex use
the `match` kwarg in `pytest.raises` instead of creating a variable
with the context manager and doing an assert on `re.search`.
* Add a short developer guide.
* Remove testing on Python 3.0, 3.1, 3.2, add 3.6 and 3.7.
* Distribute package as a universal wheel.