Set minimum server version to >=5.

Author: dlongley

lib/config.js

@@ -76,7 +76,7 @@ config.mongodb.writeOptions = {
 
 config.mongodb.requirements = {};
 // server version requirement with server-style string
-config.mongodb.requirements.serverVersion = '>=4.2';
+config.mongodb.requirements.serverVersion = '>=5';
 
 // this is used by _createUser to add a user as an admin to a collection
 // config.mongodb.collection = 'admin-collection';