Prepare 0.1.15 Baby chick release 🐥

[gmaze]

Setup

• [x] Create a new branch for this release: git checkout -b releasev0.X.Y
• [x] Update release version in ./docs/whats-new.rst
• [x] Increase release version in ./setup.py
• [x] Create a PR to prepare it, name it with one of the Nature emoji and make sure it was never used before

Prepare code for release

Code clean-up

• [ ] Run codespell from repo root and fix errors: codespell -q 2
• [ ] Run flake8 from repo root and fix errors

Software distribution readiness

• [x] Manually trigger upstream CI tests for the release branch and ensure they are passed
• [x] Activate and make sure the documentation for the release branch is built on RTD

Preparation conclusion

• [x] Merge this PR to master
• [x] Update release date in ./docs/whats-new.rst
• [x] Make sure all CI tests are passed and RTD doc is built on the master branch

Publish the release

• [x] "Draft a new release" on GitHub. Choose a release tag v0.1.15, fill in the release title and click on the Auto-generate release notes button.
  This will trigger the publish Github action that will push the release on Pypi.
• [ ] Last check the ./setup.py file version of the release and that the documentation is ready
• [ ] Publish !
• [ ] Checkout on Pypi and Conda that the new release is distributed.

CI tests / RTD build results