Upgrade Netty 4.0.39
Upgrade Netty 4.0.39

GabrielPlassard/gatling,ryez/gatling,thkluge/gatling,GabrielPlassard/gatling,GabrielPlassard/gatling,GabrielPlassard/gatling,thkluge/gatling,ryez/gatling,thkluge/gatling,ryez/gatling,ryez/gatling,thkluge/gatling