v0.3.0: Remove requirements checks

✨ New features and improvements

• Remove requirements check due to pkg_resources deprecation (#49).
• Update package metadata (#54).

🔴 Bug fixes

• Skip tests requiring git if it is not available (#55).

⚠️ Backwards incompatibilities

• Weasel no longer attempts to check requirements from requirements.txt and support for the check_requirements configuration key has been dropped.

👥 Contributors

@adrianeboyd, @honnibal, @ines, @rmitsch, @svlandeg