Update changelog

CHANGELOG.md

@@ -8,6 +8,7 @@
 - Added ```/api/v1/accounts/{id}/following``` endpoint [607eb51b](https://github.com/pixelfed/pixelfed/commit/607eb51b)
 - Added ```/api/v1/accounts/{id}/statuses``` endpoint [8ce6c1f2](https://github.com/pixelfed/pixelfed/commit/8ce6c1f2)
 - Added ```/api/v1/accounts/{id}/follow``` endpoint [f3839026](https://github.com/pixelfed/pixelfed/commit/f3839026)
+- Added ```/api/v1/accounts/{id}/unfollow``` endpoint [fadc96b2](https://github.com/pixelfed/pixelfed/commit/fadc96b2)
 
 ### Fixed
 - Update developer settings pages, fix vue bug [cd365ab3](https://github.com/pixelfed/pixelfed/commit/cd365ab3)