update gitignore

Author: Sesu8642

.gitignore

@@ -31,7 +31,6 @@
 /build/
 
 # Web related
-lib/generated_plugin_registrant.dart
 
 # Symbolication related
 app.*.symbols
@@ -43,3 +42,4 @@ app.*.map.json
 /android/app/debug
 /android/app/profile
 /android/app/release
+/release