Release 0.56.0

[enh] Add 0.56.0 changes to CHANGELOG.md

I do not remember all you have done for the release process.

So I made this branch to prepare the release. It should be merged with dev.

Then I think we merge in master, then we send a tag/release commit to master to release ?

changed milestone to %0.56.0

Me neither. A task is planned to write this down: #104 (closed).

What I would do:

• Create a commit with an associated tag on dev
• Merge all commits from dev to master
• Release on PyPI from a pipeline on master as it is only possible from master:

release:
  extends:
    - .pyenv
    - .push_to_github
  stage: release
  when: manual
  script:
    - pip install -r requirements.txt
    - pip install -r requirements_deploy.txt
    - make build
    - make deploy PYPI_LOGIN=${PYPI_LOGIN} PYPI_PASSWORD=${PYPI_PASSWORD}
  only:
    - tags
    - master

assigned to @moul

added 1 commit

• 34554ff3 - [doc] Improve v0.56.0 changelog

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added 1 commit

• d9a19626 - [doc] Improve v0.56.0 changelog

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merged