Runtime files (ftdetect, indent, syntax) for Reason Language.
This is a copy of relevant parts of jordwalke/vim-reasonml for those use case where you only want simple support for Reason Language and not the entire Merlin runtime.
Use jordwalke/vim-reasonml if you need autocompletion, diagnostics and other goodies out of the box.
I use vim-plug and recommend it unless you settled with another plugin manager:
Plug 'arrowresearch/vim-reason'
To update runtimes files from upstream:
git submodule init
git submodule update
make promote
Make sure you review and commit them.