chore(deps): update dependency nyc to v13 (#200)

Author: renovate[bot]

handwritten/error-reporting/package.json

@@ -122,7 +122,7 @@
     "mocha": "^5.1.1",
     "ncp": "^2.0.0",
     "nock": "^9.2.6",
-    "nyc": "^12.0.2",
+    "nyc": "^13.0.0",
     "once": "^1.4.0",
     "pify": "^4.0.0",
     "post-install-check": "0.0.1",