Earthmover

<details>
<summary>Released 2023-02-23</summary>

* feature: added `str_min()` and `str_max()` functions for `group by` operation
</details>

<details>
<summary>Released 2023-02-17</summary>

* feature: pass `__row_data__` dict into Jinja templates for easier dynamic column referencing
* bugfix: parameter / env var interpolation into YAML keys, not just values
* refactor error handling key assertion methods
* refactor YAML loader line number context handling
</details>

<details>
<summary>Released 2022-12-16</summary>

* trim nodes not connected to a destination from DAG
* ensure all source datatypes return a Dask dataframe
* update [optional source functionality](optional-sources) to require `columns` list, and pass an empty dataframe through the DAG
</details>

<details>
<summary>Released 2022-10-27</summary>

* support running in Google Colab
</details>

<details>
<summary>Released 2022-10-27</summary>

* support for Python 3.7
</details>

<details>
<summary>Released 2022-09-22</summary>

* initial release
</details>


Unreleased
New features

Under the hood

Fixes