Hello!

I would like to use your library to access the Ropsten network. I saw that the main change to switch networks was the base URL. I cloned your repo, and added a flag to the Account and Client init functions for use_ropsten=False. Then added an if in the init to change the URL if that is true. Testing this produced a 403 error.

I then put the Account class back to its original state, and replaced client.py with client.ropsten.py and tried again. Again, this produced a 403 bad response.

Have you encountered this issue before, and do you know the root cause of it? If I can get this working, I will submit the code.

Thank you!