fix: upgrade nyc package because of "Prototype Pollution" in peer-dependency

Author: danielkoch

package.json

@@ -50,7 +50,7 @@
     "cz-conventional-changelog": "2.1.0",
     "extract-text-webpack-plugin": "4.0.0-beta.0",
     "npm-run-all": "4.1.2",
-    "nyc": "11.6.0",
+    "nyc": "13.3.0",
     "postcss-loader": "2.1.3",
     "semistandard": "12.0.1",
     "standard-version": "4.3.0",