DOC : add release date in the changelog

Poruri Sai Rahul · Poruri Sai Rahul · commit 24c6ad636e2a · 2019-01-31T19:22:58.000+05:30
modified:   CHANGES.txt
diff --git a/CHANGES.txt b/CHANGES.txt
@@ -5,6 +5,8 @@
 Version 4.7.1
 =============
 
+Released : 31 January 2019
+
 Changes
 -------
 
