Update Makefile

Makefile

@@ -8,13 +8,13 @@ build-dev:
 	cd frontend && npm install && NODE_ENV=development npm run build && rm -rf ../static 2>&1 && cp -rv build/ ../static/
 
 run-dev:
-	FLASK_DEBUG=development python app.py
+	FLASK_DEBUG=development python3 app.py
 
 run-prod:
-	python app.py & python gradio-app.py
+	python3 app.py & python3 gradio-app.py
 
 run-mock:
-	python app.py & python gradio-mock-app.py
+	python3 app.py & python3 gradio-mock-app.py
 
 stop-server:
 	killall python