每次archive，或者flutter 升級 都有點問題，記錄下
1. 'connectivity/ConnectivityPlugin.h' file not found
嘗試以下：
(1).刪除Podfile，Podfile.lock，Pods文件夾，Runner.xcworkspace，讓flutter重新生成這幾個文件，就好了
(2).I solved my problem by File-> Workspace Settings changing build system to New Build System
(3).open runner.xcworkspace ,it worked! 打開workspace而不是 runner.proj