Add clear caches button notes in Changelog

CHANGELOG.md

@@ -57,10 +57,12 @@
     * Initial paging infrastructure for being able to incrementally load larger sets of things (like
       comments)
     * First usage of paging system: contacts
+    * A "Clear Caches" button that clears all memory and disk data. Useful if you want to do a reset
+      on things like tags, contacts, posts timelines, etc. 
     * Initial implementation of direct messaging including:
         * List of conversation threads
         * Reading conversation threads
         * Marking conversations read by tapping on the message
         * Respond in a conversation
         * Start a new conversation by searching for a known contact "type @ and start typing like in
-          posts/comments"
+          posts/comments"