Remove removed lints (dart-lang/web_socket_channel#299)
diff --git a/pkgs/web_socket_channel/analysis_options.yaml b/pkgs/web_socket_channel/analysis_options.yaml
index b7d68c9..fbdbd4e 100644
--- a/pkgs/web_socket_channel/analysis_options.yaml
+++ b/pkgs/web_socket_channel/analysis_options.yaml
@@ -10,8 +10,6 @@
- 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