Use do...end as code block delimiters

The current behaviour is considering only some keywords as block delimiters, like `defmodule...end` or `def...end`. I'm guessing this according to this behaviour in my delimiters highlighting:

Well, the behaviour I was expecting is hightlighting the `do` and `end` keywords, and not the definition ones.

My understanding goes this ways because in elixir, the block delimiters are actually `do...end`, which is actually just a syntax sugar for `do: (...)`.