update readme file and changelog

Merge pull request #97 from yasir-dev1/stable

Update Syria flag file based on https://flagicons.lipis.dev/

Merge pull request #95 from LunaGao/develop

upgrade version to 7.0.1

Merge pull request #94 from LunaGao/feature/upgrade_flutter_verison_to_3_35_3

upgrade flutter version to 3.35.3

Merge pull request #90 from ClementBeal/optimize-svg

Merge pull request #93 from tappeddev/92-expose-asset-path

- Added methods to generate asset paths for flags based on country codes and sizes.

optimize all SVGs with `svgo`

update some docs

update path

add changelog and upgrade flutter sdk

Merge pull request #83 from tappeddev/stable