[apache/incubator-teaclave] GPG error: The following signatures couldn't be verified (#471)

[master-davidlee]

when I run the last  command 
![image](https://user-images.githubusercontent.com/49427668/105863271-adc28a00-602b-11eb-83ef-1d0dfc5c6348.png)
I met an error 
![image](https://user-images.githubusercontent.com/49427668/105863327-bfa42d00-602b-11eb-86fd-9be814479865.png)


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