Don't depend on go-mode

Author: georgek

go-tag.el

@@ -6,7 +6,7 @@
 ;; URL: https://github.com/brantou/emacs-go-tag
 ;; Keywords: tools
 ;; Version: 1.1.0
-;; Package-Requires: ((emacs "24.0")(go-mode "1.5.0"))
+;; Package-Requires: ((emacs "24.0"))
 
 ;; This program is free software: you can redistribute it and/or modify
 ;; it under the terms of the GNU General Public License as published by
@@ -42,8 +42,6 @@
 
 ;;; Code:
 
-(require 'go-mode)
-
 (defgroup go-tag nil
   "Modify field tag for struct fields."
   :prefix "go-tag-"