Handle external upgrade for all websocket proxies #843
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This change upgrades websocket proxies so that an inital http request doesn't have to be made.
https://github.com/chimurai/http-proxy-middleware#external-websocket-upgrade
It supports a proposed change in Create React App by handling the upgrade of any websocket proxy passed in. facebook/create-react-app#1790
I added a test to confirm the upgrade