Developer productivity fixes

What's Changed

• Task/update readme with release info by @lbk003 in #25
• #31 fix typo in README by @lbk003 in #33
• Boosted test coverage to 90% by @MySmilingTurban in #35
• License name update in setup.py by @MySmilingTurban in #36
• minor bug fixes by @MySmilingTurban in #39

Full Changelog: v0.4.0...v0.4.1