Update parse_trans dependency

[arcusfelis]

So, it can compile.
Otherwise it gives me this error in edown:

==> edown (compile)
/home/user/erlang/arc/xapian-erlang-bindings/deps/edown/src/edown_doclet.erl:116: field packages undefined in record doclet_gen
/home/user/erlang/arc/xapian-erlang-bindings/deps/edown/src/edown_doclet.erl:118: field filemap undefined in record doclet_gen
Compiling /home/user/erlang/arc/xapian-erlang-bindings/deps/edown/src/edown_doclet.erl failed:
ERROR: compile failed while processing /home/user/erlang/arc/xapian-erlang-bindings/deps/edown: rebar_abort