Update python-publish.yml

Author: GoodManWEN

.github/workflows/python-publish.yml

@@ -17,9 +17,13 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: '3.7'
+        python-version: '3.8'
+    - name: Get latest release version number
+      id: get_version
+      uses: battila7/get-version-action@v2
     - name: Install dependencies
       run: |
+        echo ${{ steps.get_version.outputs.version-without-v }} >> tagname
         python -m pip install --upgrade pip
         pip install setuptools wheel twine requests beautifulsoup4 lxml
     - name: Build and publish