[Snyk] Security upgrade puma from 3.12.1 to 3.12.2#19

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-f89e32fc18d5f141f216ebc56bc5ac27

+4-4

Commits on Feb 29, 2020

fix: Gemfile & Gemfile.lock to reduce vulnerabilities
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