Bump version to 0.105.20 and update change log

CHANGELOG.org

 * Release 0.105.x
+** 0.105.20 (2016/05/10)
+*** Fixes
+- Update Spaceline configuration for new version
 ** 0.105.19 (2016/04/20)
 *** Fixes
 - Fix =dired-x= autoload (thanks to darkfeline)

init.el

@@ -13,7 +13,7 @@
 ;; (package-initialize)
 
 (setq gc-cons-threshold 100000000)
-(defconst spacemacs-version         "0.105.19" "Spacemacs version.")
+(defconst spacemacs-version         "0.105.20" "Spacemacs version.")
 (defconst spacemacs-emacs-min-version   "24.3" "Minimal version of Emacs.")
 
 (if (not (version<= spacemacs-emacs-min-version emacs-version))