Update test_api dependency, bump & fix lints, prepare release (#237)

Closes #236

Also remove dependency overrides

Author: kevmoo

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
       matrix:
         # Add macos-latest and/or windows-latest if relevant for this package.
         os: [ubuntu-latest]
-        sdk: [2.18.0, dev]
+        sdk: [3.0, dev]
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
       - uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d

CHANGELOG.md

@@ -1,4 +1,7 @@
-## 0.12.17-wip
+## 0.12.16+1
+
+* Require Dart 3.0
+* Support latest version of `package:test_api`.
 
 ## 0.12.16
 

analysis_options.yaml

@@ -4,8 +4,6 @@ linter:
   rules:
     - always_declare_return_types
     - avoid_private_typedef_functions
-    - avoid_returning_null
-    - avoid_returning_null_for_future
     - avoid_unused_constructor_parameters
     - cancel_subscriptions
     - comment_references

lib/matcher.dart

@@ -3,6 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Support for specifying test expectations, such as for unit tests.
+library;
+
 export 'src/core_matchers.dart';
 export 'src/custom_matcher.dart';
 export 'src/description.dart';

pubspec.yaml

@@ -1,25 +1,21 @@
 name: matcher
-version: 0.12.17-wip
+version: 0.12.16+1
 description: >-
   Support for specifying test expectations via an extensible Matcher class.
   Also includes a number of built-in Matcher implementations for common cases.
 repository: https://github.com/dart-lang/matcher
 
 environment:
-  sdk: ">=2.18.0 <3.0.0"
+  sdk: ^3.0.0
 
 dependencies:
   async: ^2.10.0
   meta: ^1.8.0
   stack_trace: ^1.10.0
   term_glyph: ^1.2.0
-  test_api: ">=0.5.0 <0.7.0"
+  test_api: ">=0.5.0 <0.8.0"
 
 dev_dependencies:
   fake_async: ^1.3.0
-  lints: ^2.0.0
+  lints: ^3.0.0
   test: ^1.23.0
-
-dependency_overrides:
-  test: 1.24.2
-  test_api: 0.5.2