Release 0.12.0

• Update to toolz 0.12.0 (#170)
  • See toolz release notes: https://github.com/pytoolz/toolz/releases/tag/0.12.0
• Build wheels automatically with cibuildwheel! (#167, #168, #169, #170)
• Support newer Python versions (#165, don't use inspect.getargspec in tests)
• Improve import times
• Use versioneer.py to manage versions
  • __version__ and __toolz_version__ are no longer available from cytoolz._version--use cython.__toolz_version__ instead.

This is the first release with automatic wheel building, versioneer for version management, and auto-upload to PyPI 🤞