Update server.py

server.py

@@ -207,4 +207,4 @@ def search_papers():
 # Running app
 if __name__ == '__main__':
     #app.run(debug=True)
-    app.run(host=‘0.0.0.0’,port=5000)
+    app.run(host='0.0.0.0',port=5000)