Add Orion Health to the list of companies in the README.

Author: unkillbob

README.md

@@ -1482,6 +1482,7 @@
   - **Money Advice Service**: [moneyadviceservice/javascript](https://github.com/moneyadviceservice/javascript)
   - **National Geographic**: [natgeo/javascript](https://github.com/natgeo/javascript)
   - **National Park Service**: [nationalparkservice/javascript](https://github.com/nationalparkservice/javascript)
+  - **Orion Health**: [orionhealth/javascript](https://github.com/orionhealth/javascript)
   - **Peerby**: [Peerby/javascript](https://github.com/Peerby/javascript)
   - **Razorfish**: [razorfish/javascript-style-guide](https://github.com/razorfish/javascript-style-guide)
   - **SeekingAlpha**: [seekingalpha/javascript-style-guide](https://github.com/seekingalpha/javascript-style-guide)