Merge pull request #630 from Baseflow/update-readme-build-status

Update build status badge to github CI

Author: renefloor

cached_network_image/README.md

@@ -1,7 +1,7 @@
 # Cached network image
 [![pub package](https://img.shields.io/pub/v/cached_network_image.svg)](https://pub.dartlang.org/packages/cached_network_image)
 [![codecov](https://codecov.io/gh/Baseflow/flutter_cached_network_image/branch/master/graph/badge.svg?token=I5qW0RvoXN)](https://codecov.io/gh/Baseflow/flutter_cached_network_image)
-[![Build Status](https://app.bitrise.io/app/4e1f9622c1f3458e/status.svg?token=sgBpcZPCUQwW37Z9J494HA&branch=master)](https://app.bitrise.io/app/4e1f9622c1f3458e)
+[![Build Status](https://github.com/Baseflow/flutter_cached_network_image/workflows/app_facing_package/badge.svg?branch=develop)](https://github.com/Baseflow/flutter_cached_network_image/actions/workflows/app_facing_package.yaml)
 
 A flutter library to show images from the internet and keep them in the cache directory.