Update HISTORY.md

HISTORY.md

@@ -27,6 +27,7 @@
     * migrated SEND blocks to be BROADCAST TO blocks
     * "when I receive 'any message'" hat scripts are threadsafe (uninterruptable by other messages)
     * changed the scale of the graphics color effect from 0-200 to 0-100
+    * result-bubbles (when clicking on a reporter) now stay visible until the next click
     * new Birdbrain Technology extensions for Finch and Hummingbird, thanks, Kristina and Bambi!
     * retired Leap Motion library
     * display blocks with their error messages for custom blocks, thanks, Michael!