README: add golint to build deps

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>

Author: roxell

README.md

@@ -38,8 +38,10 @@ See [examples/skipfile.yaml](examples/skipfile.yaml).
 1. Install golang. i.e. on debian-based systems, run `apt-get install golang`.
 2. Set GOPATH. See https://github.com/golang/go/wiki/SettingGOPATH.
 3. Install go dependencies. `go get -t ./...`
-4. go build
-5. `./skipgen`
+4. install golint. `go get -u github.com/golang/lint/golint`
+   Don't forget to setup the path PATH="$GOPATH/bin:$PATH"
+5. go build
+6. `./skipgen`
 
 ## Development