build(package): bump nyc

Update nyc to the latest version 🚀

Author: lucaperret

package.json

@@ -70,7 +70,7 @@
     "npm-run-all": "^4.1.3",
     "npm-scripts-info": "^0.3.6",
     "nsp": "^3.2.1",
-    "nyc": "^11.8.0",
+    "nyc": "^12.0.1",
     "opn-cli": "^3.1.0",
     "prettier": "^1.12.1",
     "sinon": "^5.0.3",