Update README.md

Author: sinoru

README.md

@@ -18,7 +18,7 @@ steps:
 - uses: actions/checkout@master
 - uses: sinoru/actions-setup-xcode@v2
   with:
-    xcode-version: '11.2.1' # Exact version of a Xcode version to use
+    xcode-version: '13.4' # Exact version of a Xcode version to use
     apple-id: '[email protected]' # Apple ID to download from Apple Developer when Xcode not available in local
     apple-id-password: ${{ secrets.APPLE_ID_PASSWORD }}
 - run: fastlane scan