[Snyk] Upgrade lodash from 4.17.15 to 4.17.20

[snyk-bot]

Snyk has created this PR to upgrade lodash from 4.17.15 to 4.17.20.

:sparkles: Snyk has automatically assigned this pull request, set who gets assigned.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 5 versions ahead of your current version.
• The recommended version was released 4 months ago, on 2020-08-13.

The recommended version fixes:

Severity	Issue	PriorityScore (*)	Exploit Maturity
	Prototype Pollution SNYK-JS-LODASH-608086	686/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.3	Proof of Concept
	Prototype Pollution SNYK-JS-LODASH-590103	686/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.3	No Known Exploit
	Prototype Pollution SNYK-JS-LODASH-567746	686/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.3	Proof of Concept

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

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[coveralls]

Coverage remained the same at 94.483% when pulling 80ad430337fb2c770c266b78bbe125fa31bf50c5 on snyk-upgrade-c609f74c5847366de26a9426412938cb into 9e9b70b1c2839069c4363bab812c8c17db721cb8 on master.