docs pr for next time sdk is released. must update version and date

Author: jtsodapop

CHANGELOG.md

@@ -1,3 +1,11 @@
+# Changelog
+# Version X.XX.X (2022-03-XX)
+## Updated
+* Deprecation Notice: Dropdowns will no longer be supported after 2022-03-31
+    - This includes creating/adding Dropdowns to an ontology
+    - This will not affect existing Dropdowns in an ontology
+    - For the same functionality, use Radio 
+
 # Changelog
 # Version 3.15.0 (2022-02-28) 
 ## Added