mochajs / mocha / 6807 / 7

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main: 94%

Pull #4152

travis-ci

multiple async done() calls result in failure; closes #4151

- added a method in `errors` module to create a "multiple done" err
- modernize `multiple-done.spec.js`
- refactor errors into constants in `errors` module
- remove `Runner#started` prop; replace with `Runner#state` prop + constants
- add a catchall `createFatalError()` function to `errors` module; this is called
  when a test fails twice by other means (unsure what those means are yet)
- force color in Travis CI b/c my eyes

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