Stream as any text file?

[lmmarsano]

As noted before
#208
#156
the code spec

python-dotenv/src/dotenv/main.py

Line 301 in a7fe93f

- *stream*: `StringIO` object with .env content.

is unusually restrictive.
It'd be useful to accept any text file as a stream.
My use case would be packaging a .env.defaults file opened by importlib.resources.open_text, so you can uniformly manage/document environment & defaults via .env files.

[linclelinkpart5]

Yes, I agree with this change. Having to slurp up the contents of the .env file in order to immediately repackage it as a StringIO is awkward and prohibits lazy loading of files. I'd love to instead be able to do this:

dotenv_fp = Path('path/to/.env')
with dotenv_fp.open('r') as f:
    config = dotenv.dotenv_values(stream=f)

[bbc2]

I've created #348 to fix this. Let me know if there's any problem with that PR. Otherwise I'll merge it in a few days.