Update app.py

app.py

@@ -139,6 +139,10 @@ def run_cmd(command):
 run_cmd("gcc --version")
 run_cmd("pwd")
 run_cmd("ls")
+run_cmd("cd DiffVG")
+run_cmd("git submodule update --init --recursive")
+run_cmd("python setup.py install")
+run_cmd("cd ..")