v0.2.1

GraphNetCore v0.2.1

Diff since v0.2.0

Merged pull requests:

• Updated documentation & cleaned up code (#6) (@JulianTrommer)
• Refactored docstrings (#7) (@JulianTrommer)
• Added unit tests (#8) (@JulianTrommer)
• Updated version in Project.toml (#9) (@JulianTrommer)