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Checklist
* [ ] The documentation examples have been regenerated if the Jupyter notebooks in the `examples/` have changed. To regenerate the documentation examples, run `jupyter nbconvert --to rst --output-dir=docs/examples examples/*.ipynb` from the top level directory)
* [ ] If any dependencies have changed, the changes are reflected in the
  * [ ] `setup.py`
  * [ ] `.travis.yml`
  * [ ] `appveyor.yml`

<!--

Thank you for pull request.

Below are a few things we ask you kindly to self-check before getting a review. Remove checks that are not relevant.

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Checklist
* [ ] The documentation examples have been regenerated if the Jupyter notebooks in the `examples/` have changed. To regenerate the documentation examples, run `jupyter nbconvert --to rst --output-dir=docs/examples examples/*.ipynb` from the top level directory)
* [ ] If any dependencies have changed, the changes are reflected in the
  * [ ] `setup.py`
  * [ ] `.travis.yml`
  * [ ] `appveyor.yml`
  * [ ] `conda_recipe/meta.yaml`

Update pull request template with dependency source
DOC: Update pull request template with dependency source
