Update .gitignore (#77)

diff --git a/.gitignore b/.gitignore
index 7dbf035..ac98e87 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,15 +1,4 @@
 # Don’t commit the following directories created by pub.
-.buildlog
-.pub/
-build/
-packages
+.dart_tool
 .packages
-
-# Or the files created by dart2js.
-*.dart.js
-*.js_
-*.js.deps
-*.js.map
-
-# Include when developing application packages.
-pubspec.lock
\ No newline at end of file
+pubspec.lock