docs(hydrated_bloc): README badge and asset updates

fix(hydrated_cubit): excessive fromJson invocations and storage reads

fix: excessive storage reads and fromJson invocations (felangel#69)

fix(flutter_cubit): upgrade to cubit v0.1.2 (felangel#65)

fix(cubit_test): handle breaking change in package:async (felangel#63)

fix(bloc_test): upgrade to bloc 5.0.1 (felangel#1407)

chore(angular_cubit): restrict meta version in dev_deps (felangel#64)

fix(vscode): BlocObserver and CubitObserver snippets (felangel#1402)

fix(hydrated_cubit): retain data during migration (felangel#61)

chore: bump to 5.0.2