Release 4.1.0

4.1.0

• Fix #6 The method 'HttpHeadersWrapper.set' has fewer named arguments than those of overridden method 'HttpHeaders.set'. [Dart 2.8]

Release 4.0.1+1

4.0.1+1

• Limit Dart SDK version for Dart 2.8 version breaking change.
• Add links to github repo in pubspec.yaml.