Merge pull request #1010 from emqtt/emq20

Change subscription to subscriptions

src/emqttd_cli.erl

@@ -548,7 +548,7 @@ print({ClientId, _ClientPid, _Persistent, SessInfo}) ->
                 deliver_msg,
                 enqueue_msg,
                 created_at],
-    ?PRINT("Session(~s, clean_sess=~s, subscription=~w, max_inflight=~w, inflight=~w, "
+    ?PRINT("Session(~s, clean_sess=~s, subscriptions=~w, max_inflight=~w, inflight=~w, "
            "mqueue_len=~w, mqueue_dropped=~w, awaiting_rel=~w, "
            "deliver_msg=~w, enqueue_msg=~w, created_at=~w)~n",
             [ClientId | [format(Key, get_value(Key, Data)) || Key <- InfoKeys]]).