Update styled-components to the latest version 🚀

[greenkeeper[bot]]

The dependency styled-components was updated from 4.2.0 to 4.2.1.

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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Your Greenkeeper bot :palm_tree:

[greenkeeper[bot]]

• The dependency styled-components was updated from 4.2.0 to 4.3.0.

Update to this version instead 🚀

Release Notes for v4.3.0

• Make it possible to initialize SC_ATTR and SC_DISABLE_SPEEDY via REACT_APP_* .env variables for easier integration with CRA applications (see #2501)

• Fix components being folded inappropriately when an interim HOC is present (see #2586)

• Fix theme prop for styled native components, also fixes theme in
  defaultProps for them (see #2576)

• Add "forwardedAs" prop to allow deeply passing a different "as" prop value to underlying components
  when using styled() as a higher-order component (see #2580)

• Implement defaultProps folding (see #2597)

[greenkeeper[bot]]

• The dependency styled-components was updated from 4.2.0 to 4.3.1.

Update to this version instead 🚀