vendor: update all dependencies

vendor/github.com/calebcase/tmpfile/tmpfile.go

@@ -1,3 +1,4 @@
+// Copyright 2019 Caleb Case
 // +build !windows
 
 package tmpfile
@@ -10,6 +11,12 @@ import (
 // New creates a new temporary file in the directory dir using ioutil.TempFile
 // and then unlinks the file with os.Remove to ensure the file is deleted when
 // the calling process exists.
+//
+// If dir is the empty string it will default to using os.TempDir() as the
+// directory for storing the temporary files.
+//
+// The target directory dir must already exist or an error will result. New
+// does not create or remove the directory dir.
 func New(dir, pattern string) (f *os.File, err error) {
 	f, err = ioutil.TempFile(dir, pattern)
 	if err != nil {