Update dependency eslint-plugin-mocha to v6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
eslint-plugin-mocha	devDependencies	major	5.3.0 -> 6.0.0

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Release Notes

lo1tuma/eslint-plugin-mocha

### [`v6.0.0`](https://togithub.com/lo1tuma/eslint-plugin-mocha/blob/master/CHANGELOG.md#​600-July-17-2019) [Compare Source](https://togithub.com/lo1tuma/eslint-plugin-mocha/compare/5.3.0...6.0.0) ##### Breaking Changes - Revamped recommended ruleset ([#​200](https://togithub.com/lo1tuma/eslint-plugin-mocha/pull/200)) - Drop nodejs 6 support ([#​197](https://togithub.com/lo1tuma/eslint-plugin-mocha/pull/197)) ##### Bug Fixes - Fix no-setup-in-describe to correctly detect describe calls ([#​196](https://togithub.com/lo1tuma/eslint-plugin-mocha/pull/196)) - Fix no-setup-in-describe to work with arrow functions ([#​195](https://togithub.com/lo1tuma/eslint-plugin-mocha/pull/195)) ##### Features - Implement no-return-from-async rule ([#​190](https://togithub.com/lo1tuma/eslint-plugin-mocha/pull/190)) ##### Dependency Upgrades - Update dev dependencies ([#​199](https://togithub.com/lo1tuma/eslint-plugin-mocha/pull/199)) ##### Build-Related - Add nodejs to travis build environments ([#​198](https://togithub.com/lo1tuma/eslint-plugin-mocha/pull/198))

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