[Snyk] Security upgrade mocha from 2.5.3 to 4.0.0

[kamalaknn]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `npm` 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 - package-lock.json #### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **461/1000**
**Why?** Recently disclosed, Has a fix available, CVSS 3.5 | Regular Expression Denial of Service (ReDoS)
[SNYK-JS-DEBUG-3227433](https://snyk.io/vuln/SNYK-JS-DEBUG-3227433) | Yes | No Known Exploit (*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: mocha

The new version differs by 250 commits.

• d69bf14 Release v4.0.0
• 171b9f9 pfix "prepublishOnly" potential portability problem
• 60e39d9 Update link to wiki (GitHub at the leading `--`)
• 804f9d5 Update link because GitHub ate the leading `--`
• 3326c23 update CHANGELOG for v4.0.0 [ci skip]
• 6dd9252 add link to wiki on --compilers deprecation
• 96318e1 Deprecate --compilers
• 92beda9 drop bower support
• 58a4c6a remove unused .npmignore
• 7af6611 kill Date#toISOString shim
• 43501a2 reduce noise about slow tests; make a few tests faster, etc.
• fa228e9 update --exit / --no-exit integration test for new default behavior
• 3fdd3ff Switch default from forced exit to no-exit
• c5d69e0 add integration tests for --exit/--no-exit
• 3a7f8dc enhance runMochaJSON() helper by returning the subprocess instance
• 0690d1a remove unused manual tests which remained in test/misc/
• 49e01d5 move the "only" specs out of test/misc/only/ and into test/only/
• 16ffca2 remove shims to avoid decrease in coverage
• 1f3b39a upgrade diff
• e6e3519 upgrade commander
• f1efc14 remove special treatment of unsupported node version in travis before-install script
• bc50020 upgrade debug
• 1103f9c upgrade coveralls
• f09ebf6 remove readable-stream

See the full diff

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