[Snyk] Security upgrade @parity/ui from 3.0.20 to 3.1.15#135

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-93bfa640bdde3c4ae3f2524778fa7e5a

+1,408-4,437

Commits on Jul 10, 2020

fix: js/package.json & js/package-lock.json to reduce vulnerabilities
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