Update styled-components to v4

[netmenya]

release info
https://www.styled-components.com/releases#v4.0.0

to be fixed:

1. injectGlobal -> createGlobalStyle
2. .withComponent -> 'as' prop
3. remove deprecated .extend
4. keyframes no longer returns an animation name

• check if everything else is ok

[dmitrymalakhov]

5. innerRef -> ref