chore(package): update nyc to version 13.2.0

Closes #26

Author: greenkeeper[bot]

package.json

@@ -10,7 +10,7 @@
   "devDependencies": {
     "ava": "^0.19.0",
     "coveralls": "2.x",
-    "nyc": "^10.0.0",
+    "nyc": "^13.2.0",
     "reshape": "0.5.0",
     "snazzy": "^6.0.0",
     "standard": "10.0.0"