Add colorscheme update and add filetype to buffer.

lua/tree.lua

@@ -30,7 +30,8 @@ local git = require 'lib/git'
 local refresh_git = git.refresh_git
 local force_refresh_git = git.force_refresh_git
 
-require 'lib/colors'.init_colors()
+local colors = require 'lib/colors'
+colors.init_colors()
 
 local M = {}
 
@@ -183,4 +184,9 @@ function M.find()
 
 end
 
+function M.reset_highlight()
+  colors.init_colors()
+  update_view()
+end
+
 return M