v0.4.2

What's Changed

• fixed is contained for moment by @logicalmechanism in #54
• adding tests, documentation, and some comments by @logicalmechanism in #55
• addition only added to token by @logicalmechanism in #56
• adding contributing file and updating the read to account for it by @logicalmechanism in #57
• updating v0.4.1 to v0.4.2 by @logicalmechanism in #58

Full Changelog: v0.4.1...v0.4.2