v0.4.0

What's Changed

• Clearout seaborn dep by @phobson in #37
• Generic plotting function by @phobson in #38
• switch over to pytest by @phobson in #39
• Rename lambda_ by @phobson in #40
• Fix greek lambda by @phobson in #41
• add code climate by @phobson in #42
• add python 3.6 to build, new mpl2.0 images by @phobson in #45
• update travis to only run tests once with coverage by @phobson in #46
• simplify _remove_nones function by @phobson in #47
• 2024 revamp by @phobson in #48

Full Changelog: v0.2.0...v0.4.0