patch to allow vim-go to use new vendor feature in go imports

.vimrc

let g:go_fmt_command = "goimports"
let g:go_fmt_options = "-f " . expand("%:p")

goimports.go.diff

diff --git a/cmd/goimports/goimports.go b/cmd/goimports/goimports.go
index b0b7aa8..1085f5a 100644
--- a/cmd/goimports/goimports.go
+++ b/cmd/goimports/goimports.go
@@ -22,9 +22,10 @@ import (

 var (
        // main operation modes
-       list   = flag.Bool("l", false, "list files whose formatting differs from goimport's")
-       write  = flag.Bool("w", false, "write result to (source) file instead of stdout")
-       doDiff = flag.Bool("d", false, "display diffs instead of rewriting files")
+       list    = flag.Bool("l", false, "list files whose formatting differs from goimport's")
+       write   = flag.Bool("w", false, "write result to (source) file instead of stdout")
+       doDiff  = flag.Bool("d", false, "display diffs instead of rewriting files")
+       useFile = flag.String("f", "", "real filename if using temp file")

        options = &imports.Options{
                TabWidth:  8,
@@ -78,7 +79,12 @@ func processFile(filename string, in io.Reader, out io.Writer, stdin bool) error
                return err
        }

-       res, err := imports.Process(filename, src, opt)
+       useFilename := filename
+       if *useFile != "" {
+               useFilename = *useFile
+       }
+
+       res, err := imports.Process(useFilename, src, opt)
        if err != nil {
                return err
        }