Serial: change loop delay from 20 to 5

Workaround for #5

Author: lenticularis39

src/Serial.cpp

@@ -469,7 +469,7 @@ void CSerial::run() {
       if (StopThread)
         return;
       execute();
-      CThread::sleep(20);
+      CThread::sleep(5);
     }
   }