Upgrade nyc devDependency from ^13.1.0 to ^14.0.0 (#169)

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "hallmark": "^0.1.0",
     "level-community": "^3.0.0",
     "level-concat-iterator": "^2.0.0",
-    "nyc": "^13.1.0",
+    "nyc": "^14.0.0",
     "standard": "^12.0.1",
     "tape": "^4.0.0",
     "uuid": "^3.3.2"