Ignore unnecessary_lambdas, update changelog.

Author: davidmorgan

CHANGELOG.md

@@ -2,7 +2,10 @@
 
 # 8.3.1
 
-- Add support for optional generic bounds, e.g. `class Foo<T extends Object?>`.
+- Fix generation support for optional generic bounds, e.g. 
+  `class Foo<T extends Object?>`.
+- Fix generation for classes with names starting `$`.
+- Ignore lint `unnecessary_lambdas` in generated code.
 
 # 8.3.0
 
@@ -13,7 +16,6 @@
   code.
 - Migrated `built_value_generator` to null safety. This is purely an internal
   change, the generator can still generate legacy code as and when needed.
-- fixed generation for classes that started with `$` 
 
 # 8.2.3
 

benchmark/lib/node.g.dart

@@ -91,7 +91,8 @@ class BuiltValueGenerator extends Generator {
           'sort_constructors_first,'
           'test_types_in_equals,'
           'unnecessary_const,'
-          'unnecessary_new';
+          'unnecessary_new,'
+          'unnecessary_lambdas';
     } else {
       return null;
     }