Add contributor

Author: simonua

package.json

@@ -29,7 +29,8 @@
   },
   "contributors": [
     "Simon Kurtz <simonkurtz@gmail.com> (https://github.com/simonua)",
-    "Andrew Nichols <tandrewnichols@gmail.com> (https://github.com/tandrewnichols)"
+    "Andrew Nichols <tandrewnichols@gmail.com> (https://github.com/tandrewnichols)",
+    "Donny Mellstrom (https://github.com/dmellstrom)"
   ],
   "license": "MIT",
   "dependencies": {