replace TravisCI badge with CircleCI badge
CircleCI is now running tests for each PR/commit, not Travis.
Networking plugin for pod networking in [Kubernetes](https://kubernetes.io/) using [Elastic Network Interfaces](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html) on AWS.
-[![BuildStatus Widget]][BuildStatus Result]
+[![CircleCI](https://circleci.com/gh/aws/amazon-vpc-cni-k8s.svg?style=svg)](https://circleci.com/gh/aws/amazon-vpc-cni-k8s)
[![GoReport Widget]][GoReport Status]
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-[BuildStatus Result]: https://travis-ci.org/aws/amazon-vpc-cni-k8s
-[BuildStatus Widget]: https://travis-ci.org/aws/amazon-vpc-cni-k8s.svg?branch=master
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[GoReport Status]: https://goreportcard.com/report/github.com/aws/amazon-vpc-cni-k8s
[GoReport Widget]: https://goreportcard.com/badge/github.com/aws/amazon-vpc-cni-k8s?
