bump to using cowboy 0.9.0

[myers]

This upgrades the dependencies to cowboy 0.9.0

[majek]

weren't there any major API changes between cowboy 0.8.3 and 0.9? I thought there were.

[myers]

It worked fine for me in the Elixir sample apps I was building, but your question made me go back and check the example apps in this repo. I fixed them so they run again.

[majek]

Have you tried running sockjs-protocol tests against the server?

[myers]

I've been yak shaving all morning to get the sockjs-protocol tests to run for me. I can't get master of sockjs-protocol to run against master of sockjs-erlang without error. I get the same set of errors with my branch.

Many of the errors seem to say that I don't have the right versions of the 3rd party python modules they use.

I don't know if you have any say over some of the pull requests on that repo, but sockjs/sockjs-protocol#70 looks it's moving in the right direction for that by adding a 'requirements.txt' file.