chg: 'lf cmdread' @marshmellow42 improvements from https://github.com/Proxmark/proxmark3/pull/570

chg:  and some adaptations..

client/cmdmain.c

@@ -165,7 +165,7 @@ bool WaitForResponseTimeoutW(uint32_t cmd, UsbCommand* response, size_t ms_timeo
 		
 		if (msclock() - start_time > 3000 && show_warning) {
 			PrintAndLog("Waiting for a response from the proxmark...");
-			PrintAndLog("Don't forget to cancel its operation first by pressing on the button");
+			PrintAndLog("You can cancel this operation by pressing the pm3 button");
 			show_warning = false;
 		}
 	}