Update dependency mocha to v4.1.0 (#634)

This Pull Request updates dependency [mocha](https://github.com/mochajs/mocha) from `v4.0.1` to `v4.1.0`



<details>
<summary>Release Notes</summary>

### [`v4.1.0`](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md#&#8203;410--2017-12-28)
[Compare Source](mochajs/mocha@v4.0.1...v4.1.0)
This is mainly a "housekeeping" release.

Welcome [@&#8203;Bamieh] and [@&#8203;xxczaki] to the team!
#### 🐛 Fixes

- [#&#8203;2661]: `progress` reporter now accepts reporter options ([@&#8203;canoztokmak])
- [#&#8203;3142]: `xit` in `bdd` interface now properly returns its `Test` object ([@&#8203;Bamieh])
- [#&#8203;3075]: Diffs now computed eagerly to avoid misinformation when reported ([@&#8203;abrady0])
- [#&#8203;2745]: `--help` will now help you even if you have a `mocha.opts` ([@&#8203;Zarel])
#### 🎉 Enhancements

- [#&#8203;2514]: The `--no-diff` flag will completely disable diff output ([@&#8203;CapacitorSet])
- [#&#8203;3058]: All "setters" in Mocha's API are now also "getters" if called without arguments ([@&#8203;makepanic])
#### 📖 Documentation

- [#&#8203;3170]: Optimization and site speed improvements ([@&#8203;Munter])
- [#&#8203;2987]: Moved the old [site repo](https://github.com/mochajs/mochajs.github.io) into the main repo under `docs/` ([@&#8203;boneskull])
- [#&#8203;2896]: Add [maintainer guide](https://github.com/mochajs/mocha/blob/master/MAINTAINERS.md) ([@&#8203;boneskull])
- Various fixes and updates ([@&#8203;xxczaki], [@&#8203;maty21], [@&#8203;leedm777])
#### 🔩 Other

- Test improvements and fixes ([@&#8203;eugenet8k], [@&#8203;ngeor], [@&#8203;38elements], [@&#8203;Gerhut], [@&#8203;ScottFreeCode], [@&#8203;boneskull])
- Refactoring and cruft excision ([@&#8203;38elements], [@&#8203;Bamieh], [@&#8203;finnigantime], [@&#8203;boneskull])

[#&#8203;2661]: `mochajs/mocha#2661
[#&#8203;3142]: `mochajs/mocha#3142
[#&#8203;3075]: `mochajs/mocha#3075
[#&#8203;2745]: `mochajs/mocha#2745
[#&#8203;2514]: `mochajs/mocha#2514
[#&#8203;3058]: `mochajs/mocha#3058
[#&#8203;3170]: `mochajs/mocha#3170
[#&#8203;2987]: `mochajs/mocha#2987
[#&#8203;2896]: `mochajs/mocha#2896
[@&#8203;canoztokmak]: https://github.com/canoztokmak
[@&#8203;Bamieh]: https://github.com/Bamieh
[@&#8203;abrady0]: https://github.com/abrady0
[@&#8203;Zarel]: https://github.com/Zarel
[@&#8203;CapacitorSet]: https://github.com/CapacitorSet
[@&#8203;xxczaki]: https://github.com/xxczaki
[@&#8203;maty21]: https://github.com/maty21
[@&#8203;leedm777]: https://github.com/leedm777
[@&#8203;eugenet8k]: https://github.com/eugenet8k
[@&#8203;38elements]: https://github.com/38elements
[@&#8203;Gerhut]: https://github.com/Gerhut
[@&#8203;finnigantime]: https://github.com/finnigantime

---

</details>




---

This PR has been generated by [Renovate Bot](https://renovatebot.com).

package.json

@@ -52,7 +52,7 @@
     "expect.js": "0.3.1",
     "jsdoc": "3.5.5",
     "jsdoc-template": "https://github.com/braintree/jsdoc-template",
-    "mocha": "4.0.1",
+    "mocha": "4.1.0",
     "mocha-lcov-reporter": "1.3.0",
     "q": "1.5.0",
     "sinon": "4.1.3",

yarn.lock

@@ -1648,9 +1648,9 @@ mocha-lcov-reporter@1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/mocha-lcov-reporter/-/mocha-lcov-reporter-1.3.0.tgz#469bdef4f8afc9a116056f079df6182d0afb0384"
 
-mocha@4.0.1:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/mocha/-/mocha-4.0.1.tgz#0aee5a95cf69a4618820f5e51fa31717117daf1b"
+mocha@4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/mocha/-/mocha-4.1.0.tgz#7d86cfbcf35cb829e2754c32e17355ec05338794"
   dependencies:
     browser-stdout "1.3.0"
     commander "2.11.0"