Bump codecov from 3.6.5 to 3.7.1

Bumps [codecov](https://github.com/codecov/codecov-node) from 3.6.5 to 3.7.1.
- [Release notes](https://github.com/codecov/codecov-node/releases)
- [Commits](codecov/codecov-node@v3.6.5...v3.7.1)

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

package.json

@@ -29,7 +29,7 @@
     "babel-preset-env": "1.6.0",
     "babel-preset-stage-2": "6.24.1",
     "chai": "4.1.0",
-    "codecov": "3.6.5",
+    "codecov": "3.7.1",
     "eslint": "4.19.1",
     "eslint-config-airbnb-base": "11.3.0",
     "eslint-plugin-import": "2.7.0",