Cannot pull in Drone 0.7

[HannanSolo]

When drone tries to pull the image it gets

panic: EOF
goroutine 1 [running]:
github.com/NYTimes/drone-gke/vendor/github.com/drone/drone-plugin-go/plugin.MustParse()

        /go/src/github.com/NYTimes/drone-gke/vendor/github.com/drone/drone-plugin-go/plugin/param.go:129 +0x4e
main.wrapMain(0x0, 0x0)
       /go/src/github.com/NYTimes/drone-gke/main.go:76 +0x5a3
main.main()
	/go/src/github.com/NYTimes/drone-gke/main.go:50 +0x22```

[jrynyt]

that looks like bad parameters passed in through the drone config: https://github.com/drone/drone-plugin-go/blob/master/plugin/param.go#L124-L130

unrelated to pulling image.

[HannanSolo]

Looks like I had the secrets collum when i didn't need it.