fix: only pass .env as default to starlette config if it exists

[daniellok-db]

The latest version of starlette throws if the provided config file doesn't exist.

This PR changes the Limiter class's __init__ function to pass ".env" to Config only if it exists. This should preserve existing behavior while preventing guaranteed exceptions.

[daniellok-db]

cc @laurentS @thentgesMindee would it be possible to take a look at this? please let me know if you have any concerns, or if you need more context on the issue!

[laurentS]

Hi @daniellok-db thank you for this PR. I think this is fine.
I have a feeling that the initial design was not the best, as it's essentially forcing the use of an env file, but let's not break behaviour now.

[daniellok-db]

@laurentS thanks for merging! do you have an idea of when the next release might be?

[laurentS]

@laurentS thanks for merging! do you have an idea of when the next release might be?

I'm maintaining this on my spare time, so releases are not my top priority. If you want to help speed up a new one, don't hesitate to open a release PR, like #159 and we should be able to push a new one out pretty soon.
There's been talk of a more automated release process, but we never got around to implementing anything...