npm install -g react-native-git-upgrade
CD 到项目根目录
默认最新版本 react-native-git-upgrade
react-native-git-upgrade
可以指定版本号 react-native-git-upgrade 0.56.0
react-native-git-upgrade 0.56.0
升级之后需要手动解决一下冲突，关于冲突文件会在命令行中指示出来