chore: update contributors

Author: daviddias

package.json

@@ -61,7 +61,9 @@
     "Friedel Ziegelmayer <dignifiedquire@gmail.com>",
     "Lars-Magnus Skog <ralphtheninja@riseup.net>",
     "Pau Ramon Revilla <masylum@gmail.com>",
+    "Richard Littauer <richard.littauer@gmail.com>",
     "Stephen Whitmore <stephen.whitmore@gmail.com>",
-    "greenkeeperio-bot <support@greenkeeper.io>"
+    "greenkeeperio-bot <support@greenkeeper.io>",
+    "nginnever <ginneversource@gmail.com>"
   ]
-}
+}