Update ws requirement from ^5.2.0 to ^7.0.0#12

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

dependabot/npm_and_yarn/develop/ws-tw-7.0.0

Commits on May 1, 2019

Update ws requirement from ^5.2.0 to ^7.0.0
dependabot-support
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