chore: update contributors

Author: daviddias

package.json

@@ -78,6 +78,7 @@
     "Mithgol <getgit@mithgol.ru>",
     "Nathan Ginnever <ginneversource@gmail.com>",
     "Richard Littauer <richard.littauer@gmail.com>",
+    "Stephen Whitmore <stephen.whitmore@gmail.com>",
     "Travis Person <travis.person@gmail.com>",
     "Victor Bjelkholm <victor@typeform.com>",
     "dignifiedquire <dignifiedquire@gmail.com>",
@@ -92,4 +93,4 @@
     "url": "https://github.com/ipfs/js-ipfs-api/issues"
   },
   "homepage": "https://github.com/ipfs/js-ipfs-api"
-}
+}