Bump codecov from 3.2.0 to 3.6.5

Bumps [codecov](https://github.com/codecov/codecov-node) from 3.2.0 to 3.6.5.
- [Release notes](https://github.com/codecov/codecov-node/releases)
- [Commits](https://github.com/codecov/codecov-node/commits)

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

Author: dependabot[bot]

package-lock.json

@@ -65,7 +65,7 @@
     "babel-plugin-transform-es2015-modules-umd": "^6.24.1",
     "babel-preset-env": "^1.7.0",
     "chai": "^4.1.2",
-    "codecov": "^3.2.0",
+    "codecov": "^3.6.5",
     "eslint": "^5.15.1",
     "eslint-config-airbnb-base": "^13.1.0",
     "eslint-plugin-import": "^2.16.0",