Bump to 0.6.1 (#2661)

docs/source/development.rst

@@ -283,12 +283,21 @@ PyPi package.
 
   git checkout -b 0.4.0
 
-2. Update Maigret version in three files manually:
+2. Update Maigret version in four files manually. **All four must be in
+sync** — the previous bump missed ``docs/source/conf.py`` and
+``snapcraft.yaml`` and they fell behind by a release.
 
-- pyproject.toml
-- maigret/__version__.py 
-- docs/source/conf.py
-- snapcraft.yaml
+- ``pyproject.toml`` — single line ``version = "X.Y.Z"`` under
+  ``[tool.poetry]``.
+- ``maigret/__version__.py`` — single line ``__version__ = 'X.Y.Z'``.
+- ``docs/source/conf.py`` — **two** Sphinx fields. ``release`` is the
+  full version (``'X.Y.Z'``); ``version`` is the short ``major.minor``
+  (``'X.Y'``, **without** the patch number). Update **both**.
+- ``snapcraft.yaml`` — single line ``version: X.Y.Z`` (no quotes, no
+  ``v`` prefix).
+
+After editing, sanity-check with ``grep -rE '0\.5\.|0\.6\.|<old>'`` to
+catch any straggler reference.
 
 3. Create a new empty text section in the beginning of the file `CHANGELOG.md` with a current date: