"go get" fails with "too many errors"

[Samuar]

When using either go1.13.4 and go1.12.13 linux/amd64 builds from https://golang.org/dl/ on Ubuntu 18.04, running:

go get github.com/google/easypki/cmd/easypki

Results in:

# github.com/google/easypki/cmd/easypki
go/src/github.com/google/easypki/cmd/easypki/main.go:52:37: cannot slice c.Args() (type cli.Args)
go/src/github.com/google/easypki/cmd/easypki/main.go:126:14: cannot range over c.Args() (type cli.Args)
go/src/github.com/google/easypki/cmd/easypki/main.go:159:5: app.Author undefined (type *cli.App has no field or method Author)
go/src/github.com/google/easypki/cmd/easypki/main.go:160:5: app.Email undefined (type *cli.App has no field or method Email)
go/src/github.com/google/easypki/cmd/easypki/main.go:171:17: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
	cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
go/src/github.com/google/easypki/cmd/easypki/main.go:175:4: unknown field 'EnvVar' in struct literal of type cli.StringFlag
go/src/github.com/google/easypki/cmd/easypki/main.go:184:4: cannot use r.revoke (type func(*cli.Context)) as type cli.ActionFunc in field value
go/src/github.com/google/easypki/cmd/easypki/main.go:189:4: cannot use r.crl (type func(*cli.Context)) as type cli.ActionFunc in field value
go/src/github.com/google/easypki/cmd/easypki/main.go:191:16: cannot use cli.IntFlag literal (type cli.IntFlag) as type cli.Flag in array or slice literal:
	cli.IntFlag does not implement cli.Flag (Apply method has pointer receiver)
go/src/github.com/google/easypki/cmd/easypki/main.go:196:5: cannot use caNameFlag (type cli.StringFlag) as type cli.Flag in array or slice literal:
	cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
go/src/github.com/google/easypki/cmd/easypki/main.go:196:5: too many errors

[borud]

I don't think the original author will accept any pull requests since this is unmaintained code. But I made a fork of the code and made a fix. I just added go.mod and go.sum and replaced the reference to github.com/codegangsta/cli with github.com/urfave/cli in cmd/easypki/main.go.

The fork is at https://github.com/borud/easypki