chore: update contributors

Author: vasco-santos

package.json

@@ -69,6 +69,7 @@
     "Vasco Santos <vasco.santos@ua.pt>",
     "Vasco Santos <vasco.santos@moxy.studio>",
     "Volker Mische <volker.mische@gmail.com>",
+    "achingbrain <alex@achingbrain.net>",
     "edsilv <e.silverton@gmail.com>",
     "greenkeeperio-bot <support@greenkeeper.io>",
     "haad <haad@headbanggames.com>",