2018-06-25: Stable 2.0.0 release.
2018-06-15: stabilized environment variable API.
2018-06-13: new functionality for debugging query performance.
2018-06-05: environment variables rather than command line arguments. Easier to add to existing setups.
2017-03-08: command line arguments are now necessary to get any output. If you do not pass them, no profiling occurs.