prepare v1.30.1 discontinue release (#5003)

Author: kevmoo

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 1.30.1
+
+- Clearly mark discontinued in readme.
+
 # 1.30.0
 
 - new lint: `enable_null_safety`

README.md

@@ -1,3 +1,7 @@
+# This package is discontinued.
+
+Please see the current source code at https://github.com/dart-lang/sdk/tree/main/pkg/linter
+
 # Linter for Dart
 
 The Dart Linter package defines lint rules that identify and report on "lints" found in Dart code.  Linting is performed by the Dart

pubspec.yaml

@@ -1,12 +1,10 @@
 name: linter
-version: 1.30.0
+version: 1.30.1
 
 description: >-
-  The implementation of the lint rules supported by the analyzer framework.
-  This package is not intended to be used directly.
-homepage: https://github.com/dart-lang/linter
+  Discontinued. This package is not intended to be used directly.
+homepage: https://dart.dev/tools/linter-rules
 repository: https://github.com/dart-lang/linter
-documentation: https://dart-lang.github.io/linter/lints
 
 environment:
   sdk: '>=2.17.0 <3.0.0'