Doesn't work when using styled() constructor

[Jack Davies]

Great plugin, but would be even greater if it could catch this common use case.

For example the following does not produce an error:

const Button = styled(OtherButton)`
  color: blue;
  background: white;
`

[Parmesh Krishen]

@jwld Please see #2.

[Seif Ghezala]

Solved by this, thanks to @therealparmesh