Improve error messages for channel attach when realtime is not active

Author: Sergii Zhevzhyk

lib/src/main/java/io/ably/lib/transport/ConnectionManager.java

@@ -55,7 +55,7 @@ public class ConnectionManager implements ConnectListener {
      * default errors
      ***********************************/
 
-    static ErrorInfo REASON_CLOSED = new ErrorInfo("Connection closed by client", 200, 10000);
+    static ErrorInfo REASON_CLOSED = new ErrorInfo("Can't attach when not in an active state", 200, 10000);
     static ErrorInfo REASON_DISCONNECTED = new ErrorInfo("Connection temporarily unavailable", 503, 80003);
     static ErrorInfo REASON_SUSPENDED = new ErrorInfo("Connection unavailable", 503, 80002);
     static ErrorInfo REASON_FAILED = new ErrorInfo("Connection failed", 400, 80000);