Dart: Ignore .flutter-plugins (#3398)

saschpe · web-flow · commit 07b3cd7a90de · 2020-05-06T10:30:31.000-03:00
Generated files that appear when using 'google_fonts' or other Dart
packages designed as Flutter plugins.
diff --git a/Dart.gitignore b/Dart.gitignore
@@ -19,3 +19,6 @@ doc/api/
 *.js_
 *.js.deps
 *.js.map
+
+.flutter-plugins
+.flutter-plugins-dependencies
