Added fields which triggered warnings.

package.json

 {
   "name": "aura-engine-clock",
   "version": "1.0.0",
+  "author": {
+    "name": "David Trattnig",
+    "email": "david.trattnig@subsquare.at",
+    "url": "https://subsquare.at"
+  },
+  "license" : "AGPL-3.0-only",
+  "homepage": "https://gitlab.servus.at/aura/meta",
+  "repository": {
+    "type": "git",
+    "url": "git@gitlab.servus.at:aura/engine.git"
+  },
   "scripts": {
     "build": "rollup -c",
     "dev": "rollup -c -w",