chore(deps): update dependency nyc to v15

| datasource | package | from   | to     |
| ---------- | ------- | ------ | ------ |
| npm        | nyc     | 14.1.1 | 15.0.1 |

Author: renovate-bot

package.json

@@ -31,7 +31,7 @@
     "cypress": "3.8.3",
     "html-webpack-plugin": "3.2.0",
     "istanbul-lib-coverage": "2.0.5",
-    "nyc": "14.1.1",
+    "nyc": "15.0.1",
     "source-map-support": "0.5.19",
     "styled-components": "4.4.1",
     "ts-node": "8.9.0",