generalize author attribution

multi/package.json

@@ -8,6 +8,6 @@
         "ws": "^7.4.4"
     },
     "scripts": {},
-    "author": "Pőcze Bence <bence@pocze.ch>",
+    "author": "Pőcze Bence and The Mapguesser Contributors <bence@pocze.ch>",
     "license": "GNU AGPL 3.0"
 }