Add Tradeshift to adopters list
* [Admiral](https://getadmiral.com) uses CoreDNS to handle geographic DNS requests for our public-facing microservices.
* [Qunar](https://qunar.com) uses CoreDNS for service discovery of its GPU machine learning cloud with TensorFlow and Kubernetes.
* [seansean2](https://web.mit.edu) uses coreDNS in production at MIT for DNS.
+* [Tradeshift](https://tradeshift.com/) uses CoreDNS to look up company identifiers across multiple shards/regions/zones
