Add version_added information to module parameter.

library/database/mysql_user

@@ -77,6 +77,7 @@ options:
       - Check if mysql allows login as root/nopassword before trying supplied credentials.
     required: false
     default: false
+    version_added: "1.3"
 notes:
    - Requires the MySQLdb Python package on the remote host. For Ubuntu, this
      is as easy as apt-get install python-mysqldb.