[Snyk] Fix for 6 vulnerabilities

[jwagantall]

Snyk has created this PR to fix 6 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
	Improper Verification of Cryptographic Signature SNYK-JS-ELLIPTIC-7577916	776
	Improper Verification of Cryptographic Signature SNYK-JS-ELLIPTIC-7577917	776
	Improper Verification of Cryptographic Signature SNYK-JS-ELLIPTIC-7577918	776
	Information Exposure SNYK-JS-ELLIPTIC-8720086	771
	Symlink Attack SNYK-JS-TARFS-9535930	721
	Improper Verification of Cryptographic Signature SNYK-JS-ELLIPTIC-8172694	629

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[!IMPORTANT]

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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