Change ocaml provider, closes #320

ftplugin/sexplib.vim

@@ -0,0 +1,18 @@
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'ocaml') != -1
+  finish
+endif
+
+" Language:    Sexplib
+" Maintainer:  Markus Mottl        <markus.mottl@gmail.com>
+" URL:         http://www.ocaml.info/vim/ftplugin/sexplib.vim
+" Last Change:
+"              2017 Apr 12 - First version (MM)
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin=1
+
+" Comment string
+setl commentstring=;\ %s
+setl comments=:;