enable release-drafter github action

.github/release-drafter.yml

@@ -0,0 +1,3 @@
+_extends: .github
+name-template: v$NEXT_MINOR_VERSION 🌈
+tag-template: workflow-api-$NEXT_MINOR_VERSION

.github/workflows/release-drafter.yml

@@ -0,0 +1,16 @@
+# Automates creation of Release Drafts using Release Drafter
+# More Info: https://github.com/jenkinsci/.github/blob/master/.github/release-drafter.adoc
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  update_release_draft:
+    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 }}

README.md

@@ -1,7 +1,7 @@
 # Pipeline API Plugin
 
 [![Jenkins Plugin](https://img.shields.io/jenkins/plugin/v/workflow-api)](https://plugins.jenkins.io/workflow-api)
-[![Changelog](https://img.shields.io/github/v/tag/jenkinsci/workflow-api-plugin?label=changelog)](https://github.com/jenkinsci/workflow-api-plugin/blob/master/CHANGELOG.md)
+[![GitHub Release](https://img.shields.io/github/v/tag/jenkinsci/workflow-api-plugin?label=changelog)](https://github.com/jenkinsci/workflow-api-plugin/releases/latest)
 [![Jenkins Plugin Installs](https://img.shields.io/jenkins/plugin/i/workflow-api?color=blue)](https://plugins.jenkins.io/workflow-api)
 
 # Introduction
@@ -10,3 +10,8 @@ Plugin that defines Pipeline API.
 
 A component of [Pipeline
 Plugin](https://plugins.jenkins.io/workflow-aggregator).
+
+# Changelog
+
+* For new versions, see [GitHub Releases](https://github.com/jenkinsci/workflow-api-plugin/releases)
+* For versions 2.41 and older, see the [CHANGELOG](https://github.com/jenkinsci/workflow-api-plugin/blob/master/CHANGELOG.md)