v3.1.0

• refactor: remove deprecated unawaited (use unawaited from dart:async instead).
• feat: additional lint rules:
  • avoid_final_parameters
  • avoid_multiple_declarations_per_line
  • depend_on_referenced_packages
  • no_leading_underscores_for_library_prefixes
  • no_leading_underscores_for_local_identifiers
  • unnecessary_to_list_in_spreads
  • use_if_null_to_convert_nulls_to_bools
  • use_test_throws_matchers

Thanks to @lsaudon for the contribution 💙