Websocket: added OnPong to Connection #986
Websocket: added OnPong to Connection #986

see issue #986


Former-commit-id: 964d393d40fc7e64a8bf02eae08d97fd5f847483
kataras/iris,kataras/iris,kataras/gapi,kataras/gapi,kataras/iris,kataras/iris