* Fixed non-existent variable reference in connector.rb.

Author: stamhankar999

lib/cassandra/cluster/connector.rb

@@ -283,7 +283,7 @@ def challenge_response_cycle(connection, authenticator, token)
           case r
           when Protocol::AuthChallengeResponse
             token = authenticator.challenge_response(r.token)
-            challenge_response_cycle(pending_connection, authenticator, token)
+            challenge_response_cycle(connection, authenticator, token)
           when Protocol::AuthSuccessResponse
             begin
               authenticator.authentication_successful(r.token)