* Better error message when failing to deepcopy a DAG ([670](https://github.com/ploomber/ploomber/issues/670))
* Improvements to the `{{git}}` placeholder feature ([667](https://github.com/ploomber/ploomber/issues/667))
* Replaces DAG colors in `ploomber plot` with their RGB values for better compatibility
* Pinning `jinja2` to prevent `nbconvert` from failing