Update 'src/sys.cpp'

Init Serial with baudrate 115200

src/sys.cpp

@@ -42,7 +42,7 @@
 void sysInit()
 //-----------------------------------------------------------------------------
 {
-    Serial.begin(9600);
+    Serial.begin(115200);
     pinMode(LED_BUILTIN, OUTPUT);
     opstInit(OPST_PIN);
 }