Move undo-tree to its own file

pkg/undo-tree.el

@@ -0,0 +1,26 @@
+;;; undo-tree.el --- summary
+
+;; Author: Maciej Szlosarczyk
+;; Maintainer: Maciej Szlosarczyk
+;; Version: 0.1-snapshot
+
+;;; Commentary:
+
+;; Use more advanced undo options.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;; Use more advanced undo options
+(use-package undo-tree
+  :defer t
+  :ensure t
+  :config (setq-default
+           ;; Show diff
+           undo-tree-visualizer-diff t
+           ;; Show timestamps
+           undo-tree-visualizer-timestamps t))
+
+(global-undo-tree-mode t)
+
+(provide 'pkg/undo-tree)
+;;; undo-tree.el ends here