Update list of contributors [skip ci]

Author: olivere

CONTRIBUTORS

@@ -36,6 +36,7 @@ Chris Rice [@donutmonger](https://github.com/donutmonger)
 Claudiu Olteanu [@claudiuolteanu](https://github.com/claudiuolteanu)
 Chris Duncan [@veqryn](https://github.com/veqryn)
 Christophe Courtaut [@kri5](https://github.com/kri5)
+cmitchell [@cmitchell](https://github.com/cmitchell)
 Connor Peet [@connor4312](https://github.com/connor4312)
 Conrad Pankoff [@deoxxa](https://github.com/deoxxa)
 Corey Scott [@corsc](https://github.com/corsc)