Update GUIDE.md
Update GUIDE.md

Correct Version Number
martin-kolinek/stack,anton-dessiatov/stack,MichielDerhaeg/stack,martin-kolinek/stack,juhp/stack,Fuuzetsu/stack,MichielDerhaeg/stack,juhp/stack,Fuuzetsu/stack,mrkkrp/stack,mrkkrp/stack,anton-dessiatov/stack