outline: fix merlin-imenu (#1000)
outline: fix merlin-imenu (#1000)

It hadn't been updated following the addition of type information in outline's output.
dra27/merlin,the-lambda-church/merlin,dra27/merlin,dra27/merlin,rgrinberg/merlin,rgrinberg/merlin,ocaml/merlin,dra27/merlin,rgrinberg/merlin,rgrinberg/merlin,ocaml/merlin,ocaml/merlin,the-lambda-church/merlin,the-lambda-church/merlin,ocaml/merlin