[Snyk] Upgrade ioredis from 4.17.0 to 4.17.3

[snyk-bot]

Snyk has created this PR to upgrade ioredis from 4.17.0 to 4.17.3.

: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 3 versions ahead of your current version.
• The recommended version was released 3 months ago, on 2020-05-30.

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Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open upgrade PRs.

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[coveralls]

Coverage remained the same at 39.769% when pulling 9b5dde943ea550f84bb86287a02c4268f970cfe7 on snyk-upgrade-411ef2f028743e03254d7b3a64589b96 into b27cb770a0b7dd9320334e06a58ab02f62e7a689 on master.