[minify] adds spaces

[mt-roberto]

In some cases minify feature adds some unwanted spaces.

Example:

origin:

transition: width ${(props: IProps) => props.speed}ms ease-in;

result:

transition: width 500 ms ease-in;

[Igorbek]

Thank you for reporting @mt-roberto
I will investigate the issue shortly.

[Igorbek]

Fixed by #45 and released as version 1.4.3.