chore(package): update nyc to version 12.0.1 (#140)

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "assume": "^1.5.2",
     "browserify": "^16.2.0",
     "mocha": "^5.1.1",
-    "nyc": "^11.8.0",
+    "nyc": "^12.0.1",
     "pre-commit": "^1.2.0",
     "sauce-browsers": "^1.2.0",
     "sauce-test": "^1.3.3",