Update dependency np to v5 (#56)

Author: renovate[bot]

package.json

@@ -40,7 +40,7 @@
     "esdoc-inject-script-plugin": "1.0.0",
     "esdoc-inject-style-plugin": "1.0.0",
     "esdoc-standard-plugin": "1.0.0",
-    "np": "4.0.2",
+    "np": "5.0.0",
     "nyc": "14.0.0",
     "xo": "0.24.0"
   },