Update DEVELOPMENT.md

DEVELOPMENT.md

@@ -3,12 +3,11 @@ Here's some general stuff to keep in mind, and some work that needs to be done
 * Mastodon.py tries to work for python2 as well as python3, so avoid things like annotations,
   use requests over urllib, et cetera.
 
-* Unimplemented methods:
-    * None, at time of writing!
+* Current TODOs (2.3 support):
+    * Add support for media updating
+    * Add support for focal points
+    * Add support for idempotency keys
+    * Document error handling better
+    * Update tests
+    * Decide what to do about frame_rate values specified as fractions (7/20 etc.)
     
-* Documentation that needs to be updated:
-    * Some things are probably wrong, but none known.
-    
-* Other things missing:
-    * Actual error handling that is good: Proper dealing with OAuth errors, more specific exceptions 
-