Add code

default_substitution.go

@@ -0,0 +1,16 @@
+// Copyright 2013 by Dobrosław Żybort. All rights reserved.
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package slug
+
+var defaultSub = map[rune]string{
+	'"':  "",
+	'\'': "",
+	'’':  "",
+	'‒':  "-", // figure dash
+	'–':  "-", // en dash
+	'—':  "-", // em dash
+	'―':  "-", // horizontal bar
+}