[video_player] Update README.md (flutter#3975)

Author: sldsrg

packages/video_player/video_player/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.1.5
+
+* Update example code in README to fix broken url.
+
 ## 2.1.4
 
 * Add an exoplayer URL to the maven repositories to address

packages/video_player/video_player/README.md

@@ -79,7 +79,7 @@ class _VideoAppState extends State<VideoApp> {
   void initState() {
     super.initState();
     _controller = VideoPlayerController.network(
-        'https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_20mb.mp4')
+        'https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_20mb.mp4')
       ..initialize().then((_) {
         // Ensure the first frame is shown after the video is initialized, even before the play button has been pressed.
         setState(() {});

packages/video_player/video_player/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for displaying inline video with other Flutter
   widgets on Android, iOS, and web.
 repository: https://github.com/flutter/plugins/tree/master/packages/video_player/video_player
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+video_player%22
-version: 2.1.4
+version: 2.1.5
 
 environment:
   sdk: ">=2.12.0 <3.0.0"