[Snyk] Security upgrade npmconf from 0.0.24 to 2.1.3

[snyk-io]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Uninitialized Memory Exposure npm:npmconf:20180512	286

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[snyk-io]

⛔ Snyk checks have failed. 2 issues have been found so far.

Icon	Severity	Issues
	Critical	0
	High	2
	Medium	0
	Low	0

⛔ security/snyk check is complete. 2 issues have been found. (View Details)

✅ license/snyk check is complete. No issues have been found. (View Details)

✅ code/snyk check is complete. No issues have been found. (View Details)