clia_flutter_quill

A mod of flutter_quill to be compatible with flutter_quill_extensions.

flutter_quill_extensions depends on math_keyboard, math_keyboard depends on flutter_localizations from SDK, flutter_localizations depends on intl 0.17.0.

flutter_quill depends on i18n_extension 7.0.0, which depends on intl 0.18.0.

So I downgrade the version of i18n_extension to 6.0.0, to work with flutter_quill_extensions.