update pubspec, added license to example

Author: OlehMarch

example/google_polyline_algorithm_example.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2020, the MarchDev Toolkit project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 import 'package:google_polyline_algorithm/google_polyline_algorithm.dart';
 
 void main() {

pubspec.yaml

@@ -1,7 +1,7 @@
 name: google_polyline_algorithm
-description: Dart implementation of Googles Polyline Encoding lossy compression Algorithm.
-
 version: 1.0.0
+homepage: https://github.com/marchdev-tk/google_polyline_algorithm
+description: Dart implementation of Googles Polyline Encoding lossy compression Algorithm.
 
 environment:
   sdk: '>=2.7.0 <3.0.0'