code: func (g *Gitlab) RepoRawFile(id, sha, filepath string) ([]byte, *ResponseMeta, error) {
  	u := g.ResourceUrl(RawRepositoryFileApiPath, map[string]string{
  		":id":  id,
  		":sha": sha,
  	})
  
  	q := u.Query()
  	q.Set("filepath", filepath)
  	u.RawQuery = q.Encode()
  
  	contents, meta, err := g.buildAndExecRequest("GET", u.String(), nil)
  
  	return contents, meta, err
  }
docs: /*
  Get Raw file content
  */