Update MAINTAINERS.md (connectrpc#232)

Author: rebello95

MAINTAINERS.md

@@ -4,5 +4,5 @@ Maintainers
 ## Current
 * [Peter Edge](https://github.com/bufdev), [Buf](https://buf.build)
 * [Akshay Shah](https://github.com/akshayjshah), [Buf](https://buf.build)
-* [Michael Rebello](https://github.com/rebello95), [Buf](https://buf.build)
+* [Michael Rebello](https://github.com/rebello95), [Airbnb](https://airbnb.com)
 * [Eddie Seay](https://github.com/eseay), [Chick-fil-A](https://www.chick-fil-a.com/)