Bump up version and update Changes

Author: syohex

Changes

@@ -1,5 +1,8 @@
 Revision history for go-eldoc.el
 
+Version 0.30 2017/02/12 syohex
+  - Drop older Emacs support for maintenance
+
 Version 0.28 2016/10/12 syohex
   - Add customize variable of gocode argument(Thanks Konstantin Shaposhnikov)
 

go-eldoc.el

@@ -4,7 +4,7 @@
 
 ;; Author: Syohei YOSHIDA <syohex@gmail.com>
 ;; URL: https://github.com/syohex/emacs-go-eldoc
-;; Version: 0.28
+;; Version: 0.30
 ;; Package-Requires: ((emacs "24.3") (go-mode "1.0.0"))
 
 ;; This program is free software; you can redistribute it and/or modify