Add Release Drafter to draft releases

.github/release-drafter.yml

@@ -0,0 +1,14 @@
+name-template: "$NEXT_MINOR_VERSION"
+tag-template: "$NEXT_MINOR_VERSION"
+change-template: '- $TITLE #$NUMBER [@$AUTHOR]'
+
+exclude-labels:
+  - "changelog: skip"
+
+template: |
+
+  https://pillow.readthedocs.io/en/stable/releasenotes/$NEXT_MINOR_VERSION.html
+
+  ## Changes
+
+  $CHANGES

.github/workflows/release-drafter.yml

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+name: Release drafter
+
+on:
+  push:
+    # branches to consider in the event; optional, defaults to all
+    branches:
+      - master
+
+jobs:
+  update_release_draft:
+    if: github.repository == 'python-pillow/Pillow'
+    runs-on: ubuntu-latest
+    steps:
+      # Drafts your next release notes as pull requests are merged into "master"
+      - uses: release-drafter/release-drafter@v5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}