[Snyk] Security upgrade mocha from 5.2.0 to 6.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `yarn` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

⚠️ Warning

``` Failed to update the yarn.lock, please update manually before merging. ```

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-MOCHA-561476	Yes	No Known Exploit

Check the changes in this PR to ensure they won't cause issues with your project.

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

For more information:

🧐 View latest project report

🛠 Adjust project settings

📚 Read more about Snyk's upgrade and patch logic