Non-fatal spelling error fix

Author: EraGamer

lib/group/getJoinRequests.js

@@ -7,7 +7,7 @@ var getDate = require('../util/getDate.js').func
 
 // Args
 exports.required = ['group']
-exports.optoinal = ['jar']
+exports.optional = ['jar']
 
 // Define
 exports.func = function (args) {