[Snyk] Upgrade lodash from 4.17.4 to 4.17.15

[snyk-bot]

Snyk has created this PR to upgrade lodash from 4.17.4 to 4.17.15.

: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 8 versions ahead of your current version.
• The recommended version was released a year ago, on 2019-07-19.

The recommended version fixes:

Severity	Issue	Exploit Maturity
	Prototype Pollution SNYK-JS-LODASH-73638	No Known Exploit
	Prototype Pollution SNYK-JS-LODASH-450202	Proof of Concept
	Prototype Pollution npm:lodash:20180130	No Known Exploit
	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-73639	No Known Exploit
	Prototype Pollution SNYK-JS-LODASH-567746	Proof of Concept

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