Update dependency nyc to v14 (#55)

renovate[bot] · Aurélien Ooms · commit 075d265239fb · 2019-04-16T14:36:11.000+02:00
diff --git a/package.json b/package.json
@@ -41,7 +41,7 @@
     "esdoc-inject-style-plugin": "1.0.0",
     "esdoc-standard-plugin": "1.0.0",
     "np": "4.0.2",
-    "nyc": "13.3.0",
+    "nyc": "14.0.0",
     "xo": "0.24.0"
   },
   "files": [
