panic: close of closed channel

[manishiitg]

Your environment.

• Version: master
• Browser: include version
• Other Information - stacktraces, related issues, suggestions how to fix, links for us to have context

What did you do?

https://github.com/pion/ion-sdk-go/blob/master/client.go#L241

if c.Close() is called before publish, it gives a panic

What did you expect?

What happened?