Update changelog

CHANGELOG.md

@@ -44,6 +44,7 @@
 - Added DELETE ```/api/v1/statuses``` endpoint [0a20b832](https://github.com/pixelfed/pixelfed/commit/0a20b832)
 - Added POST ```/api/v1/statuses/{id}/reblog``` endpoint [43cef282](https://github.com/pixelfed/pixelfed/commit/43cef282)
 - Added POST ```/api/v1/statuses/{id}/unreblog``` endpoint [3147fe5c](https://github.com/pixelfed/pixelfed/commit/3147fe5c)
+- Added GET ```/api/v1/timelines/tag/{hashtag}``` endpoint [2ff53be4](https://github.com/pixelfed/pixelfed/commit/2ff53be4)
 
 ### Fixed
 - Update developer settings pages, fix vue bug [cd365ab3](https://github.com/pixelfed/pixelfed/commit/cd365ab3)