Update HISTORY.md

HISTORY.md

@@ -12,6 +12,7 @@
     * export block definitions from inside the block editor
     * embed blocks into costume metadata to be shared as image file
     * exported script pics now always include the actual blocks, which can be extracted from the image inside Snap!
+    * exported scripts (!) pics now also always include either the actual blocks (if it's a single script), the block definition (if it's a block editor), or a sprite-representation of the current object (sprite or stage)
     * added green flag symbol to "when I receive" dropdown menu, support when clicking the green flag button in the IDE
     * added "combinations" primitive to the palette
     * new POSITION primitive reporter in the MOTION category