[Snyk] Upgrade react-share from 4.2.0 to 4.2.1

[snyk-bot]

Snyk has created this PR to upgrade react-share from 4.2.0 to 4.2.1.

: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 1 version ahead of your current version.
• The recommended version was released 22 days ago, on 2020-07-09.

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