Bump nyc from 14.1.1 to 15.1.0

Bumps [nyc](https://github.com/istanbuljs/nyc) from 14.1.1 to 15.1.0.
- [Release notes](https://github.com/istanbuljs/nyc/releases)
- [Changelog](https://github.com/istanbuljs/nyc/blob/master/CHANGELOG.md)
- [Commits](istanbuljs/nyc@v14.1.1...v15.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package.json

@@ -38,7 +38,7 @@
   },
   "homepage": "https://github.com/jecsham/hexyjs#readme",
   "devDependencies": {
-    "nyc": "^14.1.1",
+    "nyc": "^15.1.0",
     "tape": "^4.11.0"
   }
 }