v1.4.5: Testing updates for 3.8

This release doesn't have much user-facing.

• #53: Remove deprecated eggsecutable script
• #52: Remove use of deprecated setuptools test command
• #51: Add testing and support for Python 3.8

v1.4.4: Numerous small fixes

• #45: Use REMAINDER for run-script to allow passing arbitrary arguments
• #43: Include tests, LICENSE, & CONTRIBUTORS.txt in the source dist
• #47: Use metavar to restore helpful argument names
• #46: Fix Python 2 to open file descriptor using io.open()
• #44: Fix run-script on Python3
• #41: Always delete the temporary file in visualize()
• #42: Drop official support for EOL Pythons 2.5, 2.6, 3.2, and 3.3
• #39: Run flake8 & isort on the project
• #40: Fix filename of compiled bytecode in Python 2 tests
• #38: Use context managers to close files in a deterministic manner
• #37: Prefer literals over functions dict()/list() calls
• #36: Remove unnecessary coerce to list
• #35: Correct license in setuptools to MIT
• #34: Simplify trove classifier definition
• #33: Fix tests on Python 3
• #31: Prefer https:// URLs where available
• #30: Capitalize "Python", it is a proper noun
• #29: Trim trailing white space throughout the project
• #28: Correct capitalization of PyPI
• #27: Convert .hgignore to .gitignore
• #26: Distribute packages as a universal wheel
• #25: Add trove classifiers for modern Python versions