Enable Release drafter as Github action (#179)

.github/release-drafter.yml

@@ -0,0 +1,9 @@
+# Config for https://github.com/toolmantim/release-drafter
+name-template: 'Play Mailer $NEXT_PATCH_VERSION'
+tag-template: '$NEXT_PATCH_VERSION'
+
+change-template: '- $TITLE [#$NUMBER] by [@$AUTHOR](https://github.com/$AUTHOR)'
+template: |
+  ## Changes
+
+  $CHANGES

.github/workflows/release-drafter.yml

@@ -0,0 +1,18 @@
+name: Release Drafter
+
+on:
+  push:
+    # branches to consider in the event; optional, defaults to all
+    branches:
+      - master
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      # Drafts your next Release notes as Pull Requests are merged
+      # https://github.com/raboof/release-drafter/releases
+      # fork of https://github.com/release-drafter/release-drafter/releases
+      - uses: raboof/release-drafter@v5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}