Updated CHANGELOG to v0.9.7

CHANGELOG.md

-## Changelog
+# Changelog
+
+### v0.9.7 <small>_September 24, 2019_</small>
+* Repo: Updated .gitignore
+* Docs: Added content to Contributing
+* Repo: Slimmed down README.md
+* Docs: Renamed Release Notes to Changelog
+* Docs: Some formatting and TWITCH_CLIENT_ID info
+* Docs: Moved README.md content to docs
+* Docs: Fixed spelling and added version info
+* CI: Separated pipelines and added versioning
 
 ### v0.9.6 <small>_August 28, 2019_</small>
 * Docs: Fixed some formatting