v0.4

• 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.