Don't include trailing slash in packages list.
Don't include trailing slash in packages list.

Please see #2887 for report.

MichielDerhaeg/stack,juhp/stack,Fuuzetsu/stack,deech/stack,AndreasPK/stack,mrkkrp/stack,deech/stack,martin-kolinek/stack,mrkkrp/stack,AndreasPK/stack,anton-dessiatov/stack,martin-kolinek/stack,anton-dessiatov/stack,juhp/stack,Fuuzetsu/stack,MichielDerhaeg/stack