Bump flat, @atom/mocha-test-runner and mocha#26

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dependabot/npm_and_yarn/flat-and-atom/mocha-test-runner-and-mocha-5.0.2TheVastMajority/github:dependabot/npm_and_yarn/flat-and-atom/mocha-test-runner-and-mocha-5.0.2Copy head branch name to clipboard