chore: add utkuozdemir to contributors.md

Signed-off-by: Utku Ozdemir <uoz@protonmail.com>

CONTRIBUTORS.md

@@ -225,3 +225,4 @@
  - [gnuyent](https://github.com/gnuyent)
  - [Matthew Jones](https://github.com/matthew-jones-uk)
  - [Jakob Kukla](https://github.com/jakobkukla)
+ - [Utku Özdemir](https://github.com/utkuozdemir)