Add back equivalent async TagsUpdate command with Gutentags

vim/rc/input.rc.vim

@@ -121,9 +121,11 @@ nmap gb :bn<CR>
 nmap gB :bp<CR>
 
 " Command to display TODO tags in project
+" Generally, this is overriden in vim-grepper
 command Todo grep TODO
 
 " Easy update tags
+" Generally this is overriden by Gutentags
 command TagsUpdate !ctags -R .
 
 " Set grepprg

vim/rc/plugins.rc.vim

@@ -55,6 +55,7 @@ call s:smart_source_rc('plugins/tagbar')
 call s:smart_source_rc('plugins/tcomment_vim')
 if (v:version > 703) && !exists('g:gui_oni')
     Plug 'ludovicchabant/vim-gutentags' " Auto generate tags files
+    command! TagsUpdate :GutentagsUpdate<CR>
 end
 
 " TODO: Probably remove