Add a MongoCollection.find(FindOptions) overload.

Avoids accidental misuse of the API, erroneously treating the FindOptions value as the query.

Author: s-ludwig

mongodb/vibe/db/mongo/collection.d

@@ -519,6 +519,8 @@ struct MongoCollection {
 	  - $(LREF findOne)
 	 */
 	MongoCursor!R find(R = Bson)() { return find!R(Bson.emptyObject, FindOptions.init); }
+	/// ditto
+	MongoCursor!R find(R = Bson)(FindOptions options) { return find!R(Bson.emptyObject, options); }
 
 	///
 	@safe unittest {