annotation: fix changelog (google#1246)

Author: kevmoo

json_annotation/CHANGELOG.md

@@ -1,11 +1,7 @@
 ## 4.8.0-dev
 
-- Require Dart SDK `>=2.18.0`.
 - Added `JsonSerializable.createPerFieldToJson` which allows generating
   a `_$ModelPerFieldToJson`, enabling partial encoding of a model.
-
-## 4.7.1-dev
-
 - Update `JsonKey` documentation to align with new features in 
   `package:json_serializable`.
 - Require Dart SDK `>=2.18.0`.

json_serializable/lib/src/check_dependencies.dart

@@ -10,7 +10,7 @@ import 'package:pubspec_parse/pubspec_parse.dart';
 
 const _productionDirectories = {'lib', 'bin'};
 const _annotationPkgName = 'json_annotation';
-final requiredJsonAnnotationMinVersion = Version.parse('4.8.0-dev');
+final requiredJsonAnnotationMinVersion = Version.parse('4.8.0');
 
 Future<void> pubspecHasRightVersion(BuildStep buildStep) async {
   final segments = buildStep.inputId.pathSegments;

json_serializable/pubspec.yaml

@@ -16,7 +16,7 @@ dependencies:
 
   # Use a tight version constraint to ensure that a constraint on
   # `json_annotation` properly constrains all features it provides.
-  json_annotation: '>=4.8.0-dev <4.9.0'
+  json_annotation: '>=4.8.0 <4.9.0'
   meta: ^1.3.0
   path: ^1.8.0
   pub_semver: ^2.0.0