enhancementhelp wanted
Description
Possibly checking the babel version in the project (cwd) and using babel-register or @babel/register depending on the version.
Relevant parts of the code:
https://github.com/diegohaz/singel/blob/86d9fe65e0df14fab8bab144dfa0a88dae7bb371/src/cli.js#L29
https://github.com/diegohaz/singel/blob/86d9fe65e0df14fab8bab144dfa0a88dae7bb371/package.json#L46