Use latest lints, require Dart 2.19 or later (#524)

Author: kevmoo

.github/workflows/test-package.yml

@@ -47,7 +47,7 @@ jobs:
       matrix:
         # Add macos-latest and/or windows-latest if relevant for this package.
         os: [ubuntu-latest]
-        sdk: [2.17.0, dev]
+        sdk: [2.19.0, dev]
     steps:
       - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c
       - uses: dart-lang/setup-dart@a57a6c04cf7d4840e88432aad6281d1e125f0d46

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## 7.0.2-dev
 
+* Require Dart 2.19
 * Fix an issue in `HeaderWithIdSyntax`, do not generate heading IDs for headings
   with no content.
 

pubspec.yaml

@@ -9,7 +9,7 @@ executables:
   markdown:
 
 environment:
-  sdk: '>=2.17.0 <3.0.0'
+  sdk: '>=2.19.0 <3.0.0'
 
 dependencies:
   args: ^2.0.0
@@ -20,7 +20,7 @@ dev_dependencies:
   build_version: ^2.0.3
   build_web_compilers: '>=3.0.0 <5.0.0'
   collection: ^1.15.0
-  dart_flutter_team_lints: ^0.1.0
+  dart_flutter_team_lints: ^1.0.0
   html: ^0.15.0
   http: ^0.13.5
   io: ^1.0.0

test/markdown_test.dart

@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 @TestOn('vm')
+library;
 
 import 'package:markdown/markdown.dart';
 import 'package:test/test.dart';

test/version_test.dart

@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 @TestOn('vm')
+library;
 
 import 'dart:io';