Update flutter.gitignore

added for ios/Xcode

flutter.gitignore

@@ -8,7 +8,6 @@
 .buildlog/
 .history
 .svn/
-migrate_working_dir/
 
 # IntelliJ related
 *.iml
@@ -16,24 +15,56 @@ migrate_working_dir/
 *.iws
 .idea/
 
+# Visual Studio Code related
+.vscode/
+
 # Flutter/Dart/Pub related
 **/doc/api/
-**/ios/Flutter/.last_build_id
 .dart_tool/
 .flutter-plugins
-.flutter-plugins-dependencies
 .packages
 .pub-cache/
 .pub/
 /build/
 
-# Symbolication related
-app.*.symbols
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
 
-# Obfuscation related
-app.*.map.json
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
 
-# Android Studio will place build artifacts here
-/android/app/debug
-/android/app/profile
-/android/app/release
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages