Version bump and changelog for 0.21

CONTRIBUTING.rst

@@ -721,3 +721,48 @@ The latter is especially useful when you are debugging failing tests.
 .. note::
 
     The front-end test suite coverage is still pretty low
+
+
+Making a release
+----------------
+
+To make a new 3.4 release::
+
+    # setup
+    export NEXT_RELEASE=3.4  # replace with the next release number
+    export PREVIOUS_RELEASE=3.3  # replace with the previous release number
+
+    # ensure you have an up-to-date repo
+    git checkout develop  # use master if you're doing a hotfix release
+    git pull
+
+    # compile changelog
+    towncrier --version $NEXT_RELEASE --yes
+
+    # polish changelog
+    # - update the date
+    # - look for typos
+    # - add list of contributors via `python3 scripts/get-contributions-stats.py develop $PREVIOUS_RELEASE`
+    nano CHANGELOG
+
+    # Set the `__version__` variable to $NEXT_RELEASE
+    nano nano api/funkwhale_api/__init__.py
+
+    # commit
+    git add .
+    git commit -m "Version bump and changelog for $NEXT_RELEASE"
+
+    # tag
+    git tag $NEXT_RELEASE
+
+    # publish
+    git push --tags && git push
+
+    # if you're doing a hotfix release from master
+    git checkout develop && git merge master && git push
+
+    # if you're doing a non-hotfix release, and a real release (not a real release) from develop
+    git checkout master && git merge develop && git push
+
+Then, visit https://dev.funkwhale.audio/funkwhale/funkwhale/-/tags, copy-paste the changelog on the corresponding
+tag, and announce the good news ;)