up min required node version to 11.13 as per koa requirements
up min required node version to 11.13 as per koa requirements

kristianmandrup/koan,kristianmandrup/koan,nishant8BITS/koan,bneiluj/koan,soygul/koan,ErykB2000/koan,soygul/koan,nishant8BITS/koan,ErykB2000/koan,bneiluj/koan