chore(package): update nyc to version 13.2.0

Closes #51

Author: greenkeeper[bot]

package.json

@@ -22,7 +22,7 @@
   "devDependencies": {
     "ava": "^0.24.0",
     "codecov": "^3.0.0",
-    "nyc": "^11.4.1",
+    "nyc": "^13.2.0",
     "reshape": "^0.4.2",
     "rewire": "^3.0.0",
     "snazzy": "^7.0.0",