Merge #1348

1348: Update README.md r=poteto a=krishnavamshidevandla

Added a company name optum and its interview process

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## Add/Update/Remove <CompanyName>

- [ ] I have read the [contributing guidelines](https://github.com/poteto/hiring-without-whiteboards/blob/master/CONTRIBUTING.md)
- [ ] I agree to the [Code of Conduct](https://github.com/poteto/hiring-without-whiteboards/blob/master/CODE_OF_CONDUCT.md)
- [ ] I have followed the [format](https://github.com/poteto/hiring-without-whiteboards/blob/master/CONTRIBUTING.md#format) prescribed in the contributing guidelines
- [x] (OPTIONAL) In your pull request message, add additional context on the interview process if necessary

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Co-authored-by: Krishnavamshi <[email protected]>

README.md

@@ -633,6 +633,7 @@ Also check out [No Whiteboards](https://www.nowhiteboard.org) to search for jobs
 - [Openmind](https://www.openmindonline.it) | Monza, Italy | On-site interviews
 - [optilyz](https://optilyz.com/careers) | Remote | Either take-home or pair programming on open-source code, then pair programming on our actual production code.
 - [Optoro](http://www.optoro.com/open_position_item/?oid=134960) | Washington, DC | Take home exercise. Review your code onsite.
+- [Optum](https://www.optum.in/about/careers.html) | India, Hyderabad | Online assesment, followed by technical interview and behavioural check
 - [Ori](http://ori.co)| London, UK | Phone interview and a takehome project, followed by a two hour meeting with the team
 - [OSISM](https://osism.tech) | Remote | Three video calls: general introduction, team introduction, contract
 - [Ostmodern](http://www.ostmodern.co.uk) | London, UK | Take-home exercise & discussion on-site