bump version for new release

Merge pull request #9 from coriolinus/output-formatting

Enable output formatting

create changelog

bump minor version

The attentive will note that no code has changed since v0.1.0.
However, the crate name had been squatted, and a v0.1.0 had already
been published. I yanked all existing version on taking ownership,
but bumping the minor version is still necessary to ensure that
nobody downloads the current version while expecting the old one.

simplify