[Snyk] Security upgrade truffle-hdwallet-provider from 1.0.12 to 1.0.15#4

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-1f1d4c438cce47aa327887f6621dc974

+1,229-947

Commits on Jul 17, 2020

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