Upgrade Netty 3.9.0, close #1571
Upgrade Netty 3.9.0, close #1571

GabrielPlassard/gatling,GabrielPlassard/gatling,MykolaB/gatling,timve/gatling,MykolaB/gatling,gatling/gatling,gatling/gatling,wiacekm/gatling,pwielgolaski/gatling,gatling/gatling,MykolaB/gatling,ryez/gatling,timve/gatling,pwielgolaski/gatling,pwielgolaski/gatling,GabrielPlassard/gatling,ryez/gatling,timve/gatling,pwielgolaski/gatling,wiacekm/gatling,thkluge/gatling,ryez/gatling,thkluge/gatling,gatling/gatling,MykolaB/gatling,gatling/gatling,GabrielPlassard/gatling,ryez/gatling,wiacekm/gatling,thkluge/gatling,timve/gatling,thkluge/gatling,wiacekm/gatling,wiacekm/gatling