Merge pull request #270 from AhmedLSayed9/removed_deprecated_lint_rules

Remove deprecated lint rules

analysis_options.yaml

@@ -26,7 +26,6 @@ linter:
     - always_declare_return_types
     - always_put_control_body_on_new_line
     # - always_put_required_named_parameters_first # we prefer having parameters in the same order as fields https://github.com/flutter/flutter/issues/10219
-    - always_require_non_null_named_parameters
     # - always_specify_types # removed for redundancy: https://github.com/dart-lang/linter/issues/1848
     # - always_use_package_imports # we do this commonly
     - annotate_overrides
@@ -55,8 +54,6 @@ linter:
     - avoid_relative_lib_imports
     - avoid_renaming_method_parameters
     - avoid_return_types_on_setters
-    - avoid_returning_null
-    - avoid_returning_null_for_future
     - avoid_returning_null_for_void
     # - avoid_returning_this # there are enough valid reasons to return `this` that this lint ends up with too many false positives
     - avoid_setters_without_getters