add support for dart as a hook language

testing/resources/dart_repo/.pre-commit-hooks.yaml

@@ -0,0 +1,4 @@
+-   id: hello-world-dart
+    name: hello world dart
+    entry: hello-world-dart
+    language: dart

testing/resources/dart_repo/bin/hello-world-dart.dart

@@ -0,0 +1,6 @@
+import 'package:ansicolor/ansicolor.dart';
+
+void main() {
+    AnsiPen pen = new AnsiPen()..red();
+    print("hello hello " + pen("world"));
+}

testing/resources/dart_repo/pubspec.yaml

@@ -0,0 +1,10 @@
+environment:
+  sdk: '>=2.10.0 <3.0.0'
+
+name: hello_world_dart
+
+executables:
+    hello-world-dart:
+
+dependencies:
+  ansicolor: ^2.0.1

testing/resources/dotnet_hooks_csproj_repo/.pre-commit-hooks.yaml

@@ -1,4 +1,4 @@
--   id: dotnet example hook
+-   id: dotnet-example-hook
     name: dotnet example hook
     entry: testeroni
     language: dotnet

testing/resources/dotnet_hooks_sln_repo/.pre-commit-hooks.yaml

@@ -1,4 +1,4 @@
--   id: dotnet example hook
+-   id: dotnet-example-hook
     name: dotnet example hook
     entry: testeroni
     language: dotnet