Use the dart cli in tasks (#27)

.travis.yml

@@ -5,9 +5,7 @@ branches:
   # Semantic version tags and legacy branches of the form "1.2.x".
   - "/^\\d+\\.\\d+\\.(\\d+([+-].*)?|x)$/"
 
-# TODO(nweiz): Make this stable when Dart 2.10.0 launches with a fix for
-# dart-lang/pub#2545.
-dart: 2.8.1
+dart: stable
 
 cache:
   directories:

pubspec.yaml

@@ -5,7 +5,7 @@ author: Sass Team
 homepage: https://github.com/sass/dart-sass-embedded
 
 environment:
-  sdk: '>=2.4.0 <3.0.0'
+  sdk: '>=2.10.0 <3.0.0'
 
 executables:
   dart-sass-embedded: dart_sass_embedded

tool/grind.dart

@@ -24,11 +24,11 @@ protobuf() async {
   if (Platform.isWindows) {
     File('build/protoc-gen-dart.bat').writeAsStringSync('''
 @echo off
-pub run protoc_plugin %*
+dart pub run protoc_plugin %*
 ''');
   } else {
     File('build/protoc-gen-dart')
-        .writeAsStringSync('pub run protoc_plugin "\$@"');
+        .writeAsStringSync('dart pub run protoc_plugin "\$@"');
     run('chmod', arguments: ['a+x', 'build/protoc-gen-dart']);
   }