Updates for release drafter

Author: rikroe

.github/release-drafter.yml

@@ -1,2 +1,2 @@
 template: |
-  $CHANGES
+  ## What's changed

.github/workflows/release-drafter.yaml

@@ -61,6 +61,6 @@ jobs:
           tag: ${{ steps.calver.outputs.version }}
           name: ${{ steps.calver.outputs.version }}
           version: ${{ steps.calver.outputs.version }}
-          changes: ${{ steps.calver.outputs.changes }}
+          footer: ${{ steps.calver.outputs.changes }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}