Merge pull request #741 from sergeich/patch-1

Use ActivityCompat to check if permission is granted

android/src/main/java/com/rt2zz/reactnativecontacts/ContactsManager.java

@@ -1218,7 +1218,7 @@ private String getValueFromKey(ReadableMap item, String key) {
      */
     private String isPermissionGranted() {
         // return -1 for denied and 1
-        int res = getReactApplicationContext().checkSelfPermission(PERMISSION_READ_CONTACTS);
+        int res = ActivityCompat.checkSelfPermission(getReactApplicationContext(), PERMISSION_READ_CONTACTS);
         return (res == PackageManager.PERMISSION_GRANTED) ? PERMISSION_AUTHORIZED : PERMISSION_DENIED;
     }