Added NullDev

because why not

Author: NullDev

README.md

@@ -3770,6 +3770,7 @@ Other Style Guides
   - **Muber**: [muber](https://github.com/muber/)
   - **National Geographic**: [natgeo](https://github.com/natgeo/)
   - **Nimbl3**: [nimbl3/javascript](https://github.com/nimbl3/javascript)
+  - **NullDev**: [NullDevCo/JavaScript-Styleguide](https://github.com/NullDevCo/JavaScript-Styleguide)
   - **Nulogy**: [nulogy/javascript](https://github.com/nulogy/javascript)
   - **Orange Hill Development**: [orangehill/javascript](https://github.com/orangehill/javascript)
   - **Orion Health**: [orionhealth/javascript](https://github.com/orionhealth/javascript)