chore(deps): update dependency delay to v6

Author: renovate[bot]

package-lock.json

@@ -48,7 +48,7 @@
     "ava": "2.4.0",
     "clone": "2.1.2",
     "coveralls": "3.1.1",
-    "delay": "4.4.1",
+    "delay": "6.0.0",
     "documentation": "^14.0.3",
     "nyc": "15.1.0",
     "xo": "0.25.4"