2.13.0

CHANGES:

• Fix behavior of utop -stdin (#434, fixes #433, @tuohy)

• Handle bounds with Zed.next_error (#442, @tmattio)

• Load files from XDG directories (the legacy paths still work). (#431,
  @Skyb0rg007)

• Remove deprecated values prompt_continue, prompt_comment, smart_accept,
  new_prompt_hooks, at_new_prompt (#..., @emillon)

• Require OCaml 4.11.0 or newer. (#444, @emillon)