Update .gitignore to new dart_tool pub cache

bcko · matanlurey · commit 0dc590fca5a3 · 2018-05-30T17:22:44.000-07:00
dart-lang/sdk#32030 Closes #1344 PiperOrigin-RevId: 198576315
diff --git a/.gitignore b/.gitignore
@@ -1,7 +1,7 @@
 # Ignore artifacts generated by "pub".
 .packages
 **/build
-.pub
+.dart_tool/
 pubspec.lock
 
 # Files generated by dart tools.
