build: update package contributors

Author: dougwilson

package.json

@@ -7,7 +7,8 @@
     "Douglas Christopher Wilson <doug@somethingdoug.com>",
     "fengmk2 <fengmk2@gmail.com> (http://fengmk2.github.com)",
     "Kevin Jose Martin <kevin@tiliq.com>",
-    "Nathan Woltman <nwoltman@outlook.com>"
+    "Nathan Woltman <nwoltman@outlook.com>",
+    "Sergej Sintschilin <seregpie@gmail.com>"
   ],
   "license": "MIT",
   "keywords": [