Update README.md

Author: jakemason

README.md

@@ -174,6 +174,22 @@ function! VimTodoListsCustomMappings()
 endfunction
 ```
 
+Automatic dating
+----------------
+You can enable automatic dating of items by setting the following in your
+.vimrc:
+
+```
+let g:VimTodoListsDatesEnabled = 1
+```
+
+You can change the format of the date by setting the format variable to a valid
+strftime string like so:
+
+```
+let g:VimTodoListsDatesFormat = "%a %b, %Y"
+```
+
 Future features
 ---------------