Document BigInt support

Release v3.1.0

Clean up

feat: support bigint (#71)

Release v3.0.2

feat: check for Buffer existence (#64)

Release v3.0.1

Tweak whitespace script

Escape non-ASCII whitespace in minimal mode (#62)

Release v3.0.0

Remove problematic test

Avoid old-school Buffer usage in tests

Remove stray require

Replace string escaping with regex replace (#61)

Test in modern versions of Node.js