[Snyk] Security upgrade webpack from 3.8.1 to 4.29.0#12

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-a4e23046051ee529970e2c6eab6b9e67

+1,075-455

Commits on Mar 10, 2020

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
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