chore: update contributors

Author: daviddias

package.json

@@ -87,11 +87,14 @@
     "Francisco Baio Dias <xicombd@gmail.com>",
     "Friedel Ziegelmayer <dignifiedquire@gmail.com>",
     "Gavin McDermott <gavinmcdermott@gmail.com>",
+    "Greenkeeper <support@greenkeeper.io>",
     "Haad <haadcode@users.noreply.github.com>",
     "Harlan T Wood <harlantwood@users.noreply.github.com>",
     "Harlan T Wood <code@harlantwood.net>",
     "Holodisc <holodiscent@gmail.com>",
+    "James Halliday <substack@gmail.com>",
     "Jason Carver <jacarver@linkedin.com>",
+    "Jeff Downie <JeffDownie@users.noreply.github.com>",
     "Jeromy <why@ipfs.io>",
     "Jeromy <jeromyj@gmail.com>",
     "Joe Turgeon <arithmetric@gmail.com>",
@@ -107,7 +110,6 @@
     "Victor Bjelkholm <victor@typeform.com>",
     "elsehow <yes@cosmopol.is>",
     "ethers <ethereum@outlook.com>",
-    "greenkeeperio-bot <support@greenkeeper.io>",
     "haad <haad@headbanggames.com>",
     "nginnever <ginneversource@gmail.com>",
     "priecint <tp-dev@seznam.cz>",