Release v1.1.0

Fixed

• Missing mention condition when mention_if invalid [#7].
• Handle Slack throw error when sending message [#8].

Added

• Add unit test for all existing functions [#8].
• Add coverage information to the project [#5].
• Update README.md with new example and documentation [#4] [#8].
• Add proper project description and metadata [#8].

Changed

• Default token to ${{ github.token }} [#4].

Removed

• Remove SLACK_WEBHOOK environment usage, use url input on with instead [#4].

Full Changelog: v1...v1.1.0