Update LaTeXcompile.yml

.github/workflows/LaTeXcompile.yml

@@ -9,12 +9,11 @@ jobs:
     steps:
       - name: Set up Git repository
         uses: actions/checkout@v2
-      - name: Update Readme
-        run: |
-          ls
-          cd $GITHUB_WORKSPACE/buildtols
-          php buildreadme.php
-          cd ../
+      - name: Update README
+        uses: nanasess/setup-php@master
+        with:
+          php-version: '7.4'
+      - run: php buildtools/buildreadme.php
       - name: Commit changes
         uses: EndBug/add-and-commit@v7
         with: