Update revisions.txt

Author: Federico Fissore

build/shared/revisions.txt

@@ -16,7 +16,8 @@ ARDUINO 1.6.6
 * Added Serial Plotter. Thanks @henningpohl
 * Editor: triple click selects whole line
 * Windows: IDE startup feels faster
-* Examples of libraries with a .development flag file in their root folder will not marked read-only. See #2619
+* Examples of libraries with a .development flag file in their root folder won't get marked as read-only. See #2619
+* Update notifications: when updates are available from either Library or Boards Managers, a popup will be shown
 
 [libraries]