v0.4.0: Allow a git repo file as asset and drop support for Python 3.6

✨ New features and improvements

• Update cloudpathlib upper pin to 1.0.0 (#78).
• Update smart_open upper pin to 8.0.0 (#84).
• Drop support for EOL Python 3.6 (#85).

🔴 Bug fixes

• Fix issue #66: Support fetching a file from a git repo as an asset.

👥 Contributors

@BLKSerene, @danieldk, @honnibal, @ines, @jeffrey12cali, @ringohoffman, @svlandeg