Add .dart_tool to .gitignore (dart-lang#219)

bcko · cbracken · commit 1fd3ad671d05 · 2018-05-24T07:52:58.000-07:00
Dart SDK tooling such as pub and build_runner now use .dart_tool/ for temporary locally-cached files. dart-lang/sdk#32030
diff --git a/pkgs/coverage/.gitignore b/pkgs/coverage/.gitignore
@@ -2,6 +2,7 @@
 packages
 pubspec.lock
 build
+.dart_tool/
 .pub
 .packages
 
