Update app.py

Author: Nishant2018

app.py

@@ -99,4 +99,5 @@ def upload_predict():
     return render_template('index.html')
 
 if __name__ == '__main__':
-    app.run(debug=True)
+    import os
+    app.run(debug=True, host='0.0.0.0', port=int(os.environ.get('PORT', 5000)))