Merge branch 'pre_nnbd' into master

Author: kevmoo

checked_yaml/CHANGELOG.md

@@ -3,6 +3,10 @@
 - *BREAKING* `checkedYamlDecode` `sourceUrl` parameter is now a `Uri`.
 - Require at least Dart `2.12.0-0`.
 
+## 1.0.4
+
+- Allow `package:yaml` `v3.x`.
+
 ## 1.0.3
 
 - Require at least Dart `2.7.0`.

checked_yaml/pubspec.yaml

@@ -4,7 +4,7 @@ version: 1.9.0-nullsafety-dev
 description: >-
   Generate more helpful exceptions when decoding YAML documents using
   package:json_serializable and package:yaml.
-homepage: https://github.com/google/json_serializable.dart
+repository: https://github.com/google/json_serializable.dart
 environment:
   sdk: '>=2.12.0-0 <3.0.0'