build(deps-dev): bump codecov from 3.0.2 to 3.7.1

Bumps [codecov](https://github.com/codecov/codecov-node) from 3.0.2 to 3.7.1.
- [Release notes](https://github.com/codecov/codecov-node/releases)
- [Changelog](https://github.com/codecov/codecov-node/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-node@v3.0.2...v3.7.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -66,7 +66,7 @@
     "babel-polyfill": "6.26.0",
     "chess.js": "0.10.2",
     "clean-webpack-plugin": "0.1.19",
-    "codecov": "3.0.2",
+    "codecov": "3.7.1",
     "commitizen": "2.10.1",
     "css-loader": "0.28.11",
     "cz-conventional-changelog": "2.1.0",