Merge pull request #18 from bcko/patch-1

Update .gitignore to new `dart_tool` pub cache
diff --git a/.gitignore b/.gitignore
index 4232a2f..a433102 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .packages
+.dart_tool/
 .pub/
 packages
 pubspec.lock