Changed ensure_future to new syntax using async
Changed ensure_future to new syntax using async

diraol/kytos,renanrodrigo/kytos,erickvermot/kytos,cemsbr/kytos,diraol/kytos,kytos/kyco,diraol/kytos,cemsbr/kytos,kytos/kytos,erickvermot/kytos,cemsbr/kytos,erickvermot/kytos,macartur/kytos