Replace useColors -> colors

[luiz]

This PR contains:

• bugfix
• feature
• refactor
• tests
• documentation
• metadata

Breaking Changes?

• yes
• no

If yes, please describe the breakage.

Please Describe Your Changes

Uses option colors instead of useColors with mocha, removing a deprecation warning issued when running tests with mocha-chrome in other projects (screenshot below shows an example).

[nathanboktae]

LGTM!

[sluukkonen]

useColors has been removed in mocha 8, so currently mocha-chrome throws the following kind of exception with it.

[chrome-exception] {
  timestamp: 1599162811322.0051,
  exceptionDetails: {
    exceptionId: 2,
    text: 'Uncaught',
    lineNumber: 25927,
    columnNumber: 16,
    url: 'http://localhost:9990/node_modules/mocha/mocha.js',
    stackTrace: { callFrames: [Array] },
    exception: {
      type: 'object',
      subtype: 'error',
      className: 'TypeError',
      description: 'TypeError: self[opt] is not a function\n' +
        '    at http://localhost:9990/node_modules/mocha/mocha.js:25928:17\n' +
        '    at Array.forEach (<anonymous>)\n' +
        '    at Mocha.mocha$1.setup (http://localhost:9990/node_modules/mocha/mocha.js:25926:7)\n' +
        '    at set (<anonymous>:18:13)\n' +
        '    at http://localhost:9990/node_modules/mocha/mocha.js:25980:23\n' +
        '    at http://localhost:9990/node_modules/mocha/mocha.js:4:92\n' +
        '    at http://localhost:9990/node_modules/mocha/mocha.js:5:2',
      objectId: '{"injectedScriptId":2,"id":3}',
      preview: [Object]
    },
    executionContextId: 2
  }
}

[shellscape]

[twpol]

All the changes here seem to be useColors --> colors, however, the screenshot at the top of the Mocha message and my local testing indicates it should have been useColors --> color (note the lack of s on the end).

Because of this, the code still does not work with Mocha 8.

[shellscape]

Please feel free to open a PR and show where the error is in the messaging you reference.

[sluukkonen]

Whatever the correct spelling is, mocha-chrome needs a new release.