Release v0.4.0
* Report non-conforming files on the same line to aid line-oriented processing
* Fix help, summary, and version flag contents.
* Fix indentation of leading comments in parens
v0.3.0
* Added check flag for use in CI.
* Added quiet flag to disable all output on stderr.
* Further improved indentation.
* Fixed bugs where Nix code with different semantics was emitted in some cases.