- Fix subsequent-sibling combinator `~` without spaces around it (Lauri Rooden)
 - Fix inefficient regular expression (Lauri Rooden)

Enhancements:

 - Use c8 for coverage (Lauri Rooden)
 - Rename selector.js to index.js (Lauri Rooden)
 - Throw on not string matcher (Lauri Rooden)
 - Replace travis with github actions and litejs with @litejs/cli (Lauri Rooden)