Add ThomasMiz as a maintainer (#532)

Author: Perksey

README.md

@@ -48,6 +48,7 @@ Silk.NET caters for anything you could need in swift development of multimedia,
 We currently have the following maintainers:
 - [Dylan Perks](https://github.com/Perksey) [<img src="https://about.twitter.com/etc/designs/about2-twitter/public/img/favicon.ico" alt="Follow Dylan Perks on Twitter" width="16" />](https://twitter.com/intent/follow?screen_name=Dylan_Perks)
 - [Kai Jellinghaus](https://github.com/HurricanKai)
+- [Thomas Mizrahi](https://github.com/ThomasMiz)
 
 In addition, the Silk.NET working group help drive larger user-facing changes providing key consultation from the perspective of dedicated users and professionals.