Update README.md

Author: uiolee

README.md

@@ -47,7 +47,7 @@ steps:
         echo "::warning title=Invalid file permissions automatically fixed::$line"
       done
   - name: Upload Pages artifact
-    uses: actions/upload-pages-artifact@v2
+    uses: actions/upload-pages-artifact@v3
 # ...
 ```
 
@@ -62,7 +62,7 @@ steps:
         echo "::warning title=Invalid file permissions automatically fixed::$line"
       done
   - name: Upload Pages artifact
-    uses: actions/upload-pages-artifact@v2
+    uses: actions/upload-pages-artifact@v3
 # ...
 ```