Update mocha requirement from ^3.2.0 to ^6.1.4#3

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dependabot-preview[bot] wants to merge 1 commit into

dependabot/npm_and_yarn/mocha-tw-6.1.4

Commits on May 23, 2019

Update mocha requirement from ^3.2.0 to ^6.1.4
dependabot-support
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