Issue 45 (#49)

* fix txt records returned as string instead of UInt8List

* fix key sent instead of value

* fix issue #45

android/src/main/AndroidManifest.xml

@@ -18,5 +18,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.nimroddayan.flutternsd">
     <uses-permission android:name="android.permission.INTERNET"/>
-
+    <uses-permission android:name="android.permission.NEARBY_DEVICES" />
 </manifest>