Modified for 1.9.1 version change

Author: ankit-bhatnagar167

DESCRIPTION.rst

@@ -26,8 +26,9 @@ Release Notes
     - Update Python Driver URL Whitelist to support US Gov domain
     - Fix memory leak in python connector panda df fetch API
 
-- v1.9.0(August 26,2019)
+- v1.9.1(October 4,2019)
 
+    - Add asn1crypto requirement to mitigate incompatibility change.
     - Implement converter for all arrow data types in python connector extension
     - Fix arrow error when returning empty result using python connecter
     - Fix OCSP responder hang, AttributeError: 'ReadTimeout' object has no attribute 'message'