Bump codecov from 3.5.0 to 3.7.1 (#172)

Bumps [codecov](https://github.com/codecov/codecov-node) from 3.5.0 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](https://github.com/codecov/codecov-node/commits/v3.7.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -27,7 +27,7 @@
     "babel-core": "6.26.3",
     "babel-preset-es2015": "6.24.1",
     "babel-preset-stage-0": "6.24.1",
-    "codecov": "3.5.0",
+    "codecov": "3.7.1",
     "jasmine": "2.8.0",
     "jasmine-spec-reporter": "4.0.0",
     "nyc": "14.1.1"