Update express for negotiator RegExp DoS 
Update express for negotiator RegExp DoS 

* https://nodesecurity.io/advisories/106
* older express depended on older accepts which required vulnerable negotiator 
* See PRs for context
  * https://github.com/jshttp/negotiator/commit/26a05ec15cf7d1fa56000d66ebe9c9a1a62cb75c
  * https://github.com/expressjs/express/pull/3006
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