v0.4.0

Changelog

• a1f0089 bump up version for release
• 14aa267 feat: use public client id and secret
• 83223ca refactor: move if else while initializing field
• fa41a7a refactor: pull up if-else for PR vs Commit populator
• b800928 refactor: rename var commits to messages
• 2f95f9b refactor: use struct directly instead of constructor function