Update changelog

CHANGELOG.md

@@ -1,7 +1,19 @@
-# Changelog
+# Release Notes
 
-All notable changes to `pixelfed-api-php` will be documented in this file
+## [Unreleased](https://github.com/dansup/pixelfed-php/compare/v0.0.1...master)
+### Added
+- Added ```followAccountById``` method
+- Added ```unfollowAccountById``` method
+- Added ```accountBlockById``` method
+- Added ```accountUnblockById``` method
+- Added ```statusFavouriteById``` method
+- Added ```statusUnfavouriteById``` method
+- Added ```mediaUpload``` method
+- Added ```accountMuteById``` method
+- Added ```accountUnmuteById``` method
+- Added ```statusCreate``` method
+- Added Code of Conduct
 
-## 0.0.1 - 2019-10-21
+## 0.0.1 (2019-10-21)
 
 - Initial release