1.23.0

1.23.0

• fixed no_leading_underscores_for_local_identifiers
  to lint local function declarations
• fixed avoid_init_to_null to correctly handle super
  initializing defaults that are non-null
• updated no_leading_underscores_for_local_identifiers
  to allow identifiers with just underscores
• fixed flutter_style_todos to support usernames that
  start with a digit
• updated require_trailing_commas to handle functions
  in asserts and multi-line strings
• updated unsafe_html to allow assignments to
  img.src
• fixed unnecessary_null_checks to properly handle map
  literal entries