chore(package): update nyc to version 14.1.0

Closes #76

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
     "coveralls": "^3.0.0",
     "dfinity-radix-tree": "^0.2.3",
     "level-browserify": "^1.1.2",
-    "nyc": "^12.0.1",
+    "nyc": "^14.1.0",
     "primea-hypervisor": "^0.9.2",
     "standard": "^11.0.1",
     "tape": "^4.9.0",