requirements updated
requirements updated

RomanZacharia/pyethapp,changwu-tw/pyethapp,danielnovy/test,changwu-tw/pyethapp,heikoheiko/pyethapp,kustomzone/pyethapp,gsalgado/pyethapp,vaporry/pyethapp,ethereum/pyethapp,ethereum/pyethapp,d-das/pyethapp,gsalgado/pyethapp,RomanZacharia/pyethapp