Update list of contributors

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Author: olivere

CONTRIBUTORS

@@ -74,6 +74,7 @@ Garrett Kelley [@GarrettKelley](https://github.com/GarrettKelley)
 Gaspard Douady [@plopik](https://github.com/plopik)
 Gaylord Aulke [@blafasel42](https://github.com/blafasel42)
 Gerhard Häring [@ghaering](https://github.com/ghaering)
+gregoryfranklin [@gregoryfranklin](https://github.com/gregoryfranklin)
 Guilherme Silveira [@guilherme-santos](https://github.com/guilherme-santos)
 Guillaume J. Charmes [@creack](https://github.com/creack)
 Guiseppe [@gm42](https://github.com/gm42)