Update flowconfig and remove pod lock file

Author: Kai Guo

.flowconfig

@@ -36,6 +36,8 @@ module.file_ext=.ios.js
 
 munge_underscores=true
 
+server.max_workers=1
+
 # Support the library import in examples
 module.name_mapper='^\@react-native-community/async-storage$' -> '<PROJECT_ROOT>/lib/AsyncStorage.js'