     (powerline-center-theme)
     (setq powerline-default-separator 'contour))
 
+(use-package undo-tree
+  :ensure t
+  :defer t
+  :bind (("C-z" . undo-tree-undo)
+         ("C-S-z" . undo-tree-redo))
+  :init
+    (global-undo-tree-mode t)
+  :diminish undo-tree-mode)
+
 ;; Web-mode
 (use-package web-mode
   :ensure t

;; Key bindings
(global-set-key (kbd "C-c C-c") 'comment-or-uncomment-region-or-line)
(global-set-key (kbd "C-x C-k") 'kill-this-buffer)
(global-set-key (kbd "C-z")     'undo-tree-undo)
(global-set-key (kbd "C-S-z")   'undo-tree-redo)

(custom-set-variables
 ;; custom-set-variables was added by Custom.


;; linum-off package
(paradox-require 'linum-off)

;; js2-mode package
(paradox-require 'js2-mode)
