Update styled-components in group default to the latest version 🚀

[greenkeeper]

The dependency styled-components was updated from 3.4.10 to 4.1.2.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[adammahmood]

This requires some minor refactoring to upgrade.

See: https://www.styled-components.com/docs/faqs#what-do-i-need-to-do-to-migrate-to-v4

[greenkeeper]

• The dependency styled-components was updated from 3.4.10 to 4.1.3.

Update to this version instead 🚀

[tgandrews]

This has some issues:

1. Not supported by jest-styled-components for assertions. Bring compatibility with v4 styled-components/jest-styled-components#191
2. For some reason shallow rendering a styled-component loses the name and it appears as ForwardRef supposedly this has been fixed in displayName set on forwardRef is not honored enzymejs/enzyme#1810 but updating all the dependencies does not seem to solve it. This needs more investigation.

[adammahmood]

Upgrade to be tackled a later date. Ticket added to Trello.
https://trello.com/c/Zz9M8T8s/97-upgrade-styled-components-to-v4