Introduce towncrier

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,6 @@
 <!-- add an 'x' in the brackets below -->
 
-- [ ] I have added an entry to `docs/changelog.md`
+- [ ] I have added a news fragment under `changelog.d/` (if the patch affects the end users)
 
 ## Summary of changes
 

.github/workflows/tests.yml

@@ -139,7 +139,7 @@ jobs:
       - name: Create pull request branch
         run: git switch -c "bump-changelog-for-${RELEASE_VERSION}"
       - name: Update changelog
-        run: echo -e "## dev\n\n## $RELEASE_VERSION\n$(tail -n +2 CHANGELOG.md)" > CHANGELOG.md
+        run: pipx run towncrier build --version $RELEASE_VERSION
       - name: Commit and push change
         run: |
           git config --global user.name 'github-actions[bot]'