部署fabric ca时遇到的问题

• ** github.com/hyperledger/fabric-ca/lib
  lib/server.go:710:23: cert.Issuer.String undefined (type pkix.Name has no field or method String)
  lib/server.go:711:24: cert.Subject.String undefined (type pkix.Name has no field or method String)
  Makefile:111: recipe for target ‘bin/fabric-ca-server’ failed
  make: * [bin/fabric-ca-server] Error 2
  root@ubuntu:/opt/gopath/src/github.com/hyperledger/fabric-ca# go
  Go is a tool for managing Go source code.**

• 官方要求的go版本是1.9+，上面的环境使用的是1.9，更新go至最新版本