[Snyk] Security upgrade json from 2.0.3 to 2.3.0#278

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-b125b3ef3110f062bd058ab4314e40fb

+4-4

Commits on Mar 22, 2020

fix: Gemfile & Gemfile.lock to reduce vulnerabilities
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