Bump up version and update Changes

Author: syohex

Changes

@@ -1,5 +1,9 @@
 Revision history for go-eldoc.el
 
+Version 0.21 2014/12/19 syohex
+  - Fix error when highlights return value of function
+    which has map type arguments(#26)
+
 Version 0.20 2014/12/02 syohex
   - Fix highlighting function parameter issue
   - Fix byte-compile issue

go-eldoc.el

@@ -4,7 +4,7 @@
 
 ;; Author: Syohei YOSHIDA <syohex@gmail.com>
 ;; URL: https://github.com/syohex/emacs-go-eldoc
-;; Version: 0.20
+;; Version: 0.21
 ;; Package-Requires: ((go-mode "0") (cl-lib "0.5"))
 
 ;; This program is free software; you can redistribute it and/or modify