Adding netlify build status to README

README.md

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 # PagerDuty Incident Response Documentation [![Build Status](https://circleci.com/gh/PagerDuty/incident-response-docs/tree/master.svg?style=svg)](https://circleci.com/gh/PagerDuty/incident-response-docs)
+[![Netlify Status](https://api.netlify.com/api/v1/badges/ca66d085-7d5f-4a57-81c7-4eb104c9bdb7/deploy-status)](https://app.netlify.com/sites/incident-response-docs/deploys)
 This is a public version of the Incident Response process used at PagerDuty. It is also used to prepare new employees for on-call responsibilities, and provides information not only on preparing for an incident, but also what to do during and after. See the [about page](docs/about.md) for more information on what this documentation is and why it exists.
 
 You can view the documentation [directly](docs/index.md) in this repository, or rendered as a website at https://response.pagerduty.com.