v0.1.6 release prep

[smmaurer]

This PR prepares the OSMnet v0.1.6 release, which provides compatibility with GeoPandas v0.7 and later.

The easiest way to implement that was for this version of OSMnet to require GeoPandas v0.7+, which means that it no longer supports Python 2.7 or Win32. (OSMnet v0.1.5 continues to install and run fine on older platforms, for anyone who needs it.)

cc @sablanchard @knaaptime @blakerosenthal

Previously merged:

• PR Fixes incompatibility with GeoPandas 0.7 #21

Changes in this PR:

CI cleanup

• Pins pytest-cov to an earlier version to resolve an installation incompatibility with Coveralls, similar to what's described here
• Updates pycodestyle settings (the defaults must have changed)
• In Travis, adds Python 3.8 and drops 2.7
• Updates the AppVeyor script to be cleaner and more targeted
• Switches AppVeyor from Win32 to Win64

Other changes

• Bumps the Pandas requirement to correspond to GeoPandas 0.7
• Adds a setting in setup.py to require Python 3 (following instructions here)
• Updates copyright year in license and docs
• Updates version numbers in setup, init, and docs
• Adds version info to the main doc page
• Cleans up and documents the doc building procedure
• Updates contribution guide with additional info drawn from other UDST repos
• Renames HISTORY to CHANGELOG and adds an entry for this release
• Cleans up some cruft in the repo, like references to ez_setup

Testing:

• Unit tests are passing on Mac (local), Linux (travis), and Windows (appveyor)

Next steps:

• Merge this to dev
• Release on PyPI
• Update conda-forge feedstock
• Update live docs
• Merge to master
• Tag release on GitHub
• Confirm that Pip and Conda automatically install previous version in Python 2.7

And we should probably go through the other deprecation warnings when we have a chance (@sablanchard), and fix things before the library breaks again!

[smmaurer]

The Travis and AppVeyor tests aren't showing up automatically anymore (looking into it..)

https://travis-ci.org/github/UDST/osmnet/pull_requests
https://ci.appveyor.com/project/pksohn/osmnet/history

[sablanchard]

looks good!

[knaaptime]

awesome folks, thanks! Glad you guys ended up being ok with the api change to the projection function (i assumed it was mostly intended as a private method anyway). I was planning on doing the reformatting commit but glad to see this make it in, even without it :)