feat: built-in undotree plugin

Author: nathanzeng

init.lua

@@ -121,6 +121,9 @@ vim.o.breakindent = true
 
 -- Enable undo/redo changes even after closing and reopening a file
 vim.o.undofile = true
+-- To open a visual and interactive undo tree, type :Undotree
+-- See `:help :Undotree`
+vim.schedule(function() vim.cmd.packadd 'nvim.undotree' end)
 
 -- Case-insensitive searching UNLESS \C or one or more capital letters in the search term
 vim.o.ignorecase = true