Fixed error

On my RPi3 I'm seeing a failure to find units because send() is demanding a Buffer or String. Uint8Array works for me in every other environment I've tried, but something about the RPi wants this to be a buffer. Having it as a buffer also works in other environments, thankfully.

index.js

@@ -44,7 +44,7 @@ class FindUnits extends EventEmitter {
   }
 
   sendServerBroadcast() {
-    var message = new Uint8Array(8);
+    var message = Buffer.alloc(8);
     message[0] = 1;
     this.finder.send(message, 0, message.length, 1444, "255.255.255.255");
     //console.log("Looking for ScreenLogic hosts...");