fix: safer detection for styled and css tags. fixes #279 (#280)
fix: safer detection for styled and css tags. fixes #279 (#280)

This PR fixes issue [#279](https://github.com/callstack/linaria/issues/279) where files using generic parameters in `styled` call wasn't included for processing in `transform.js`. They were skipped, because RegEx there didn't expect TypeScript's generic function syntax.

New regex just searches for words `styled` or `css`.
It is more false-positive prone, but more safe, as it should also correctly detect usages such as:
```typescript
import { styled } from "linaria/react";

export type TitleProps = {
    color: string;
}

export const Title = styled<TitleProps>.h1`
    color: ${props => props.color};
`;
```
or
```javascript
import { styled as s } from "linaria/react";

export const Title = s.h1`
    color: tomato;
`;
```
callstack/linaria,callstack/linaria,callstack/linaria