Added a TODO on the types of modules.
Added a TODO on the types of modules.

rgrinberg/merlin,the-lambda-church/merlin,fxfactorial/merlin,neojski/merlin,haselwarter/merlin,rgrinberg/merlin,dra27/merlin,rgrinberg/merlin,chambart/merlin,ocaml/merlin,fxfactorial/merlin,the-lambda-church/merlin,chambart/merlin,rgrinberg/merlin,ocaml/merlin,chriskonstad/merlin,fxfactorial/merlin,neojski/merlin,fxfactorial/merlin,haselwarter/merlin,chriskonstad/merlin,neojski/merlin,haselwarter/merlin,chambart/merlin,dra27/merlin,chambart/merlin,ocaml/merlin,neojski/merlin,ocaml/merlin,haselwarter/merlin,dra27/merlin,dra27/merlin,the-lambda-church/merlin