Remove diffmatchpatch_test.go because it is now empty
diff --git a/diffmatchpatch/diffmatchpatch_test.go b/diffmatchpatch/diffmatchpatch_test.go
deleted file mode 100644
index 8bc5f88..0000000
--- a/diffmatchpatch/diffmatchpatch_test.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright (c) 2012 Sergi Mansilla <sergi.mansilla@gmail.com>
-// https://github.com/sergi/go-diff
-// See the included LICENSE file for license details.
-//
-// go-diff is a Go implementation of Google's Diff, Match, and Patch library
-// Original library is Copyright (c) 2006 Google Inc.
-// http://code.google.com/p/google-diff-match-patch/
-
-package diffmatchpatch