- New feature: `--extra key "python format string"`, for adding additional output keys to the human-readable version of the diff. [38](https://github.com/simonw/csv-diff/issues/38)
- Don't crash in JSON format mode if some JSON keys are missing. [13](https://github.com/simonw/csv-diff/issues/13)
- Now includes a `Dockerfile` and instructions for building and running it that way. Thanks, [gourk](https://github.com/gourk). [#11](https://github.com/simonw/csv-diff/issues/11)