Feature Request: Add goerli testnet

[corpetty]

Should be relatively self explanatory.

[John-E5]

Hey guys,
I'd like to take this on if you don't mind.
To implement it

• add new file client.goerli.py

• import from client.py, client class

• override PREFIX with goerli endpoint

As im currently studying python can you confirm that this is the correct approach?

[corpetty]

Looking at the Ropsten implementation now, I think this should be refactored to be a keyword argument in the default client, which overrides the PREFIX with the correct endpoint when specified.

I'm pretty sure that's all that is necessary.

Let me know what you attempt and I'll review changes.

[John-E5]

Ok thanks Corey,
I should have something for you to review in the next few days

[corpetty]

anything @John-E5 ?

[John-E5]

I have but I've been away most the week so nothing pushed yet, I'll be home tomorrow and I'll push for you to review @corpetty