add changelog

Author: ichung08

.github/workflows/build-release-import-script.yml

@@ -93,6 +93,11 @@ jobs:
         with:
           tag_name: ${{ steps.get_version.outputs.VERSION }}
           release_name: Astro Import Script ${{ steps.get_version.outputs.VERSION }}
+          body: |
+            ## What's Changed
+            ${{ steps.changelog.outputs.CHANGELOG }}
+
+            For full changelog, see [here](https://github.com/${{ github.repository }}/compare/${{ env.PREVIOUS_TAG }}...${{ steps.get_version.outputs.VERSION }})
           draft: false
           prerelease: false