4.0.0

• dispatch returns the provided action
• Removed Dart 1.x support
• Enforce Pedantic package lint rules
• Enforce public_member_api_docs lint rule and add docs to missing parts
• Update travis.yml with support for dartfmt, analysis, and code coverage
• Add coverage badge to root README
• Pub.dev updates
  • Longer description
  • https for package url
  • update example folder to include README