Adding Yonatan Sherwin to AUTHORS file

AUTHORS

@@ -49,6 +49,7 @@ Takuya Murakami <tmurakam@tmurakam.org>
 Thomas Darimont <thomas.darimont@gmail.com>
 Till Brychcy <till.brychcy@mercateo.com>
 Victor Williams Stafusa da Silva <victorwssilva@gmail.com>
+Yonatan Sherwin <yonatansherwin@gmail.com>
 Yun Zhi Lin <yun@yunspace.com>
 
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