Update dependency np to v5.2.1

Author: renovate-bot

package.json

@@ -48,7 +48,7 @@
     "esdoc-standard-plugin": "1.0.0",
     "fingertree": "0.1.7",
     "microtime": "3.0.0",
-    "np": "5.1.3",
+    "np": "5.2.1",
     "nyc": "14.1.1"
   },
   "files": [