update changelog action

.github/workflows/changelog.yml

@@ -1,25 +1,25 @@
 name: Changelog and Version Bump Check
+
 on:
-  push:
-    branches:
-      - development
-      - main
   pull_request:
     branches:
-      - development
       - main
+      - development
 
 jobs:
   check-changelog-version:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
 
       - name: Get list of changed files
         id: changed-files
         run: |
-          echo "::set-output name=files::$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | tr '\n' ' ')"
+          git fetch origin ${{ github.event.pull_request.base.ref }}
+          echo "::set-output name=files::$(git diff --name-only origin/${{ github.event.pull_request.base.ref }} ${{ github.sha }} | tr '\n' ' ')"
 
       - name: Determine changed packages
         id: determine-packages