Publish version 0.7.0

[matei-tm]

Publish checklist

• [x] Update the src/pubspec.yaml with the required version
• [x] Update the changelog
• [x] Update documentation
  • [x] README.md (+version sync)
  • [x] src/README.md (+version sync)
  • [x] example/README.md
• [x] Format the code
  • [x] in src dartfmt -w --fix src
  • [x] in example dartfmt -w --fix example
• [x] Run tests
  • [x] cd src
  • [x] pub run test
  • [x] cd ..
  • [x] cd example
  • [x] flutter test
  • [x] flutter drive --target=test_driver/app.dart
  • [x] cd ..
• [x] Commit with message #xxxx. Publish review completed
• [x] Merge develop changes into master
  • [x] Check CI results
• [x] Dry run
  • [x] cd src
  • [x] pub publish --dry-run
• [x] Publish pub publish
• [ ] Commit empty git commit --allow-empty -m "Completed publish closes #xxxx."