Downgrade the SDK version to get the maximum compatibility range.

Author: cloudwebrtc

example/pubspec.yaml

@@ -6,7 +6,7 @@ description: Demonstrates how to use the flutter_callkeep plugin.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.2.2 <3.0.0"
 
 dependencies:
   flutter:

pubspec.yaml

@@ -1,12 +1,12 @@
 name: flutter_callkeep
 description: A new flutter plugin project.
 version: 0.0.1
-author:
-homepage:
+author: [email protected]
+homepage: https://github.com/flutter-webrtc/callkeep
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
-  flutter: ">=1.20.0 <2.0.0"
+  sdk: ">=2.2.2 <3.0.0"
+  flutter: ^1.10.0
 
 dependencies:
   flutter: