Construct the Module portion of the ast in a portable way

[asottile]

Resolves #1551

[asottile]

thanks for fixing the title, github got really confused when I switched bases and I apparently can't type the same thing twice!

[davidism]

I added myself to the notification list for the BPO issue, I'll wait a bit to see if anyone responds.

[davidism]

Just to check, are we sure ast.parse is better than sys.version_info?

if sys.version_info >= (3, 8):
    module = ast.Module([func_code], [])
else:
    module = ast.Module([func_code])

It's at least clear what the compat fix is in this case, even though it's yet another version flag.

[asottile]

when this inevitably changes again, ast.parse() will hand us a blank module object that already has all the new attributes

[davidism]

Moving every closer to just generating a string of Python code 😂

[asottile]

Moving every closer to just generating a string of Python code joy

lol but actually 🤦‍♂️

I'll rebase this one once #1554 merges 👍

[davidism]

Don't worry about rebasing, I'm taking care of it.