Remove <4.0.0 constraints on flutter in pubspecs (#65)

* Remove <4.0.0 constraints on flutter in pubspecs

* Update changelog

Upgrade to flutter 3.3.0 + lint upgrade and fixes (#63)

* Remove unused import

* Upgrades in example/android/

* Move lint to dev dependencies + upgrade it to 1.10.0

* Deprecation fix in example/

* Replace direct imports with package: import

* Lint fixes

* Changelog

* Changelog new version 3.0.0

* Update version in pubspec + set sdk version to min 3.0.0

* Adapt dart + min flutter version again in pubspec

Prepare for v2.1.0 release (#61)

* feat: update pubspec to v2.1.0

* docs: update changelog date for v2.1.0

fix: example/pubspec.lock should not be committed (#52)

Merge pull request #33 from TinyCommunity/release-preparation

Release preparation