drop outdated lints (#46)

Author: kevmoo

analysis_options.yaml

@@ -13,28 +13,21 @@ linter:
     - avoid_classes_with_only_static_members
     - avoid_private_typedef_functions
     - avoid_redundant_argument_values
-    - avoid_returning_null
-    - avoid_returning_null_for_future
     - avoid_returning_this
     - avoid_unused_constructor_parameters
     - avoid_void_async
     - cancel_subscriptions
-    - comment_references
     - join_return_with_assignment
     - literal_only_boolean_expressions
     - missing_whitespace_between_adjacent_strings
     - no_adjacent_strings_in_list
     - no_runtimeType_toString
     - package_api_docs
-    - prefer_const_constructors
     - prefer_const_declarations
     - prefer_expression_function_bodies
     - prefer_final_locals
-    - prefer_relative_imports
-    - test_types_in_equals
     - unnecessary_await_in_return
     - unnecessary_breaks
     - use_if_null_to_convert_nulls_to_bools
     - use_raw_strings
     - use_string_buffers
-    - use_super_parameters

pubspec.yaml

@@ -8,6 +8,6 @@ environment:
 
 dev_dependencies:
   csv: ^5.0.0
-  dart_flutter_team_lints: ^1.0.0
+  dart_flutter_team_lints: ^2.0.0
   dart_style: ^2.0.0
   test: ^1.16.0