Updating the maintainer list with newly added maintainers

Signed-off-by: Alexander Schwartz <[email protected]>

MAINTAINERS.md

@@ -5,8 +5,13 @@ These people will be able to comment on, review and (if successfully reviewed) m
 
 Everyone else from the community is welcome to comment on issues, answer questions and review pull requests.
 
-* [Pedro Igor](https://github.com/pedroigor)
-* [Marek Posolda](https://github.com/mposolda)
-* [Tomáš Kyjovský](https://github.com/tkyjovsk)
+In alphabetical order:
+
 * [Alexander Schwartz](https://github.com/ahus1)
 * [Kamesh Akella](https://github.com/kami619)
+* [Marek Posolda](https://github.com/mposolda)
+* [Michal Hajas](https://github.com/mhajas)
+* [Pedro Igor](https://github.com/pedroigor)
+* [Pedro Ruivo](https://github.com/pruivo)
+* [Ryan Emerson](https://github.com/ryanemerson)
+* [Tomáš Kyjovský](https://github.com/tkyjovsk)