Updated RELEASE_NOTES.

RELEASE_NOTES.md

@@ -1,5 +1,11 @@
 # Release Notes
 
+## 2.56
+
+Don't show instance announcements in public timelines.
+
+Added auto boosting. If an account has this flag enabled, all mentions to that account are automatically boosted to all its followers, behaving like a `Group` actor (contributed by sarahpw).
+
 ## 2.55
 
 Mastodon API: fixed a last-minute bug that broke some API functions.