Added a descriptor option number for ocaml-protoc-plugin

docs/options.md

@@ -212,3 +212,7 @@ with info about your project (name and website) so we can add an entry for you.
 1. Dart port of protocol buffers
    * Website https://github.com/dart-lang/protobuf
    * Extensions: 1073
+
+1. Ocaml-protoc-plugin
+   * Website: https://github.com/issuu/ocaml-protoc-plugin
+   * Extensions: 1074