Bump yargs-parser and nyc

Bumps [yargs-parser](https://github.com/yargs/yargs-parser) to 18.1.3 and updates ancestor dependency [nyc](https://github.com/istanbuljs/nyc). These dependencies need to be updated together.


Updates `yargs-parser` from 11.1.1 to 18.1.3
- [Release notes](https://github.com/yargs/yargs-parser/releases)
- [Changelog](https://github.com/yargs/yargs-parser/blob/main/CHANGELOG.md)
- [Commits](https://github.com/yargs/yargs-parser/compare/v11.1.1...v18.1.3)

Updates `nyc` from 13.3.0 to 15.1.0
- [Changelog](https://github.com/istanbuljs/nyc/blob/master/CHANGELOG.md)
- [Commits](https://github.com/istanbuljs/nyc/compare/v13.3.0...v15.1.0)

---
updated-dependencies:
- dependency-name: yargs-parser
  dependency-type: indirect
- dependency-name: nyc
  dependency-type: direct:production
...

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

package.json

@@ -16,7 +16,7 @@
     "codecov": "^3.5.0",
     "mocha": "^5.2.0",
     "node-fetch": "^2.6.0",
-    "nyc": "^13.1.0",
+    "nyc": "^15.1.0",
     "ora": "^3.4.0",
     "server": "^1.0.19"
   },