Add changelogs

[amaury1093]

#93 introduces a breaking change, we should write changelogs right after.

Maybe with something like https://github.com/lerna/lerna-changelog?

[axelchalon]

sounds good!

[ltfschoen]

We'll need to update lerna, and hopefully soon with dependabot #28

[axelchalon]

Changelogs are now implemented since d80eb90

We're now using lerna version --conventional-commits in the CI to tag and publish a new release. This takes care of two things:

• Bump the version of the packages and root workspace (incl. dependencies to the other packages within the monorepo) with patch, minor or major automatically depending on the commit messages since the latest tag.
• Generate CHANGELOG.md at the root and for each package

The only thing we need to do to make this work is respect the specs from https://www.conventionalcommits.org/ (I would suggest squash merging the PRs with a conventional-commits-compliant commit message from now on)

[amaury1093]

Do you know what happens if we don't squash-merge with a conventional commit message? I suppose (and hope) no version bumping would happen?

Edit: just tried, it actually patched the version.