v0.3.0

Unless you are implementing the Fd interface yourself, the only change you may need to make is changing something like new Directory({ "foo.c": foo_file }) to new Directory([["foo.c", foo_file]]) and similarly for PreopenDirectory.

What's Changed

• Rework the public api and implement a bunch of missing methods by @bjorn3 in #73

Full Changelog: v0.2.21...v0.3.0