Fix changes workflow (#1935)

* add changes workflow

* Update update-changes.yaml

Author: dvora-h

.github/workflows/update-changes.yaml

@@ -15,10 +15,10 @@ jobs:
           fetch-depth: 0
       - name: Update CHANGES file
         run: |
-          sed -i '1s/^/* ${{ github.event.head_commit.message }}. Thanks @${{ github.actor }}\n/' changes
+          sed -i '1s/^/* ${{ github.event.head_commit.message }}. Thanks @${{ github.actor }}\n/' CHANGES
       - name: Commit & Push changes
         uses: actions-js/push@master
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           branch: master
-          message: ${{ github.event.head_commit.message }}
+          message: ${{ github.event.head_commit.message }}