cmd: fix bug with --bundle and multiple inputs, fixes #683

cmd/minify/main.go

@@ -425,7 +425,7 @@ func run() int {
  if dirDst {
  output += string(os.PathSeparator)
  }
- } else if 1 < len(inputs) {
+ } else if !bundle && 1 < len(inputs) {
  Error.Println("must specify --bundle for multiple input files with stdout destination")
  return 1
  }