Update WifiConnection.cpp (#9)

Setting Hostname did not work in my setup with Fritzbox 5590.
Did a bit of research and found that calling "WiFi.mode(WIFI_MODE_NULL);" might be necessary for setHostname to be sucessfull.

Worked for me.

src/Components/WiFi/WifiConnection.cpp

@@ -39,6 +39,7 @@ namespace WifiConnection
 
         // Set host name
         WiFi.config(INADDR_NONE, INADDR_NONE, INADDR_NONE, INADDR_NONE);
+        WiFi.mode(WIFI_MODE_NULL);
         WiFi.setHostname("HeidelBridge");
 
         // Register WiFi events
@@ -51,4 +52,4 @@ namespace WifiConnection
         WiFi.begin(Credentials::WiFi::SSID, Credentials::WiFi::Password);
         gStatistics.NumWifiDisconnects = 0;
     }
-};
+};