add emacs mode string to CHANGES file (so hopefully, links to issues and PRs will be generated when viewed on github.com)

Author: lots0logs

CHANGES

@@ -52,4 +52,5 @@
 [2016-07-20 00:37:58 +0530]  Drop support for Gtk-3.16                                               Khurshid Alam  {c565223}
 [2016-07-20 00:21:53 +0530]  [Gtk-3.18] Provide gap between buttons in message dialog. Fixes #498    Khurshid Alam  {58642c3}
 [2016-07-15 08:59:15 +0300]  Fix for issue #492 (#496)                                               Alexey Donoga  {76321bb}
-[2016-07-02 07:44:33 +0200]  GTK 3.20 :: Optimized Nemo and Nautilus design and update searchbar..   Csaba Jakosa   {bd780f0}
+[2016-07-02 07:44:33 +0200]  GTK 3.20 :: Optimized Nemo and Nautilus design and update searchbar..   Csaba Jakosa   {bd780f0}
+# -*- mode: gfm; -*-