Release 0.3.0

What's Changed

Features

• Add support for abort signals when calling on and once by @pleek91 in #26
• Adds count method for counting event handlers by @pleek91 in #29

Docs

• Overhaul Docs by @pleek91 in #30
• Add api docs by @pleek91 in #28

Maintenance

• Organize project and add type tests by @pleek91 in #27

Full Changelog: v0.2.0...v0.3.0