Add update-release.yml

.github/workflows/update-release.yml

@@ -0,0 +1,33 @@
+name: Update changelog in release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Get version from tag
+        id: tag_name
+        run: echo ::set-output name=current_version::${GITHUB_REF#refs/tags/v}
+
+      - name: Get changelog entry
+        id: changelog_reader
+        uses: mindsers/changelog-reader-action@v2
+        with:
+          version: ${{ steps.tag_name.outputs.current_version }}
+          path: ./Changelog.md
+
+      - name: Update release
+        id: update_release
+        uses: tubone24/update_release@v1.0
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        with:
+          release_name: ${{ steps.changelog_reader.outputs.version }}
+          body: ${{ steps.changelog_reader.outputs.changes }}