CI: automated changelog (#105)

* CI: automate chengelog

.github/workflows/main.yml

@@ -38,6 +38,18 @@ jobs:
         artifacts: './module.json, ./module.zip'
         tag: ${{ github.event.release.tag_name }}
         body: ${{ github.event.release.body }}
+    - name: Update CHANGELOG
+      id: changelog
+      uses: requarks/changelog-action@v1
+      with:
+        token: ${{ github.token }}
+        tag: ${{ github.ref_name }}
+    - name: Commit CHANGELOG.md
+      uses: stefanzweifel/git-auto-commit-action@v4
+      with:
+        branch: master
+        commit_message: 'docs: update CHANGELOG.md for ${{ github.ref_name }} [skip ci]'
+        file_pattern: CHANGELOG.md
 
     # Autopublish to the Foundry Admin panel
     - name: FoundryVTT AutoPublish