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Added versioning documentation [ci skip]

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Andrew Murray 2020-12-21 17:45:43 +11:00
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RELEASING.md
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# Versioning
Pillow follows Semantic Versioning. From https://semver.org/:
> Given a version number MAJOR.MINOR.PATCH, increment the:
> 1. MAJOR version when you make incompatible API changes,
> 2. MINOR version when you add functionality in a backwards compatible manner, and
> 3. PATCH version when you make backwards compatible bug fixes.
Quarterly releases (referred to as "Main Release" in the checklist below) bump at
least the MINOR version, as new functionality has likely been added in the prior three
months.
A quarterly release bumps the MAJOR version when make incompatible API changes are
made, such as removing deprecated APIs or dropping an EOL Python version. In practice,
these occur every 12-18 months, guided by Python's EOL schedule, and any APIs that have
been deprecated for at least a year are removed at the same time.
PATCH versions ("Point Release" or "Embargoed Release" in the checklist below) are for
security, installation or critical bug fixes. These are less common as it is preferred
to stick to quarterly releases.
Between quarterly releases, ".dev0" is appended to the version, indicating that this is
not a formally released copy.
# Release Checklist
## Main Release