CurlImpersonateHttpClient warning on Windows

[janbuchar]

Using the CurlImpersonateHttpClient adds this warning message upon program start, which doesn't seem to be fixed if I add in the command that it asks for

    asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())
    await crawler.run(["https://www.mtggoldfish.com/metagame/modern#paper"])

.venv\Lib\site-packages\curl_cffi\aio.py:137: RuntimeWarning:
    Proactor event loop does not implement add_reader family of methods required.
    Registering an additional selector thread for add_reader support.
    To avoid this warning use:
        asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())

Originally posted by @MrTyton in #486 (comment)

[janbuchar]

@MrTyton Looks like you have to add asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy()) before asyncio.run(), i.e., before your event loop is created.

[vdusek]

I believe we should document this somewhere, follow-up issue is ok

[janbuchar]

I believe we should document this somewhere, follow-up issue is ok

I'm not so sure about that, it's a limitation of a package that we integrate with and the warning tells you what to do pretty well. Maybe we can add a line about this into the docblock of CurlImpersonateHttpClient.