[Snyk] Security upgrade lodash from 4.17.15 to 4.17.20

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	776/1000 Why? Recently disclosed, Has a fix available, CVSS 9.8	Prototype Pollution SNYK-JS-LODASH-590103	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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For more information:
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📚 Read more about Snyk's upgrade and patch logic

[coveralls]

Coverage remained the same at 82.101% when pulling bd2eb8a on snyk-fix-da8b11764c76d2f78b4d9e756412505a into c0dfbc2 on master.