fix(deps): update dependency react-helmet to v6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
react-helmet	dependencies	major	5.2.1 -> 6.0.0

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Release Notes

nfl/react-helmet

### [`v6.0.0`](https://togithub.com/nfl/react-helmet/blob/master/CHANGELOG.md#​600-httpsgithubcomnflreact-helmetcompare520600-2020-04-09) [Compare Source](https://togithub.com/nfl/react-helmet/compare/aa72dffb198d8cf45caedd6fd5c8c4584e2888d2...6.0.0) ### [6.0.0](https://togithub.com/nfl/react-helmet/compare/5.2.0...6.0.0) (2020-04-09)

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