[Snyk] Upgrade bluebird from 3.5.1 to 3.7.2

[snyk-bot]

Snyk has created this PR to upgrade bluebird from 3.5.1 to 3.7.2.

: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 5 months ago, on 2019-11-28.

The recommended version fixes:

Severity	Issue
	LGPL-3.0 license snyk:lic:npm:express-cassandra:LGPL-3.0

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