Allow httpx > 0.17.x

[fabaff]

httpx-0-17.0 was released but at the moment only 0.16.x is supported.

pytest_httpx/setup.py

Line 41 in 6dddd90

install_requires=["httpx==0.16.*", "pytest==6.*"],

It would be nice to the version constrain could be updated. Thanks.

[Colin-b]

Fixed in release 0.11.0

[fabaff]

Thanks