Fix some lint errors

android/java/lib/src/main/AndroidManifest.xml

@@ -8,10 +8,4 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
-    <receiver android:name="com.mapbox.mapboxgl.lib.MapView.ConnectivityReceiver" android:exported="false">
-        <intent-filter>
-            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
-        </intent-filter>
-    </receiver>
-
 </manifest>

android/java/lib/src/main/java/com/mapbox/mapboxgl/lib/MapView.java

@@ -1177,7 +1177,7 @@ public class MapView extends SurfaceView {
     //
 
     // This class handles connectivity changes
-    private class ConnectivityReceiver extends BroadcastReceiver {
+    public class ConnectivityReceiver extends BroadcastReceiver {
 
         // Called when an action we are listening to in the manifest has been sent
         @Override