Fails with strings styled with background and foreground

[slammayjammay]

PR for a demo test: #21

Looks like slicing a string styled with background and foreground colors fails.

const str = chalk.bgGreen.black('test');
// => '\u001b[42m\u001b[30mtest\u001b[39m\u001b[49m'

const sliced = sliceAnsi(str, 0, 1);
// => '\u001b[42m\u001b[30mt\u001b[39m'

const full = sliceAnsi(str, 0, 4)
// => '\u001b[42m\u001b[30mtest\u001b[39m\u001b[49m'

I'm not super familiar with ansi escape sequences but it looks like sliced is missing the part that ends the bgGreen color, '\u001b[49m'.

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Failing test:

https://github.com/chalk/slice-ansi/blob/67699dedbdf3bbe7b05678bf3665baab8f62d9c4/test.js#L61-L65

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