Bumping k8s dependencies to 1.13

vendor/golang.org/x/tools/cmd/digraph/digraph.go

@@ -8,7 +8,7 @@
 //
 // TODO(adonovan):
 // - support input files other than stdin
-// - suport alternative formats (AT&T GraphViz, CSV, etc),
+// - support alternative formats (AT&T GraphViz, CSV, etc),
 //   a comment syntax, etc.
 // - allow queries to nest, like Blaze query language.
 //
@@ -89,11 +89,12 @@ Example usage:
 `
 
 func main() {
+	flag.Usage = func() { fmt.Fprintln(os.Stderr, Usage) }
 	flag.Parse()
 
 	args := flag.Args()
 	if len(args) == 0 {
-		fmt.Println(Usage)
+		fmt.Fprintln(os.Stderr, Usage)
 		return
 	}