v 2.2.0 fails when missing zstd

[lsbardel]

When installing the latest versions (>2.0.0) on an Ubuntu distribution I get this.

    from httpx2 import ASGITransport, AsyncClient
.venv/lib/python3.14/site-packages/httpx2/__init__.py:2: in <module>
    from ._api import *
.venv/lib/python3.14/site-packages/httpx2/_api.py:6: in <module>
    from ._client import Client
.venv/lib/python3.14/site-packages/httpx2/_client.py:13: in <module>
    from ._auth import Auth, BasicAuth, FunctionAuth
.venv/lib/python3.14/site-packages/httpx2/_auth.py:12: in <module>
    from ._models import Cookies, Request, Response
.venv/lib/python3.14/site-packages/httpx2/_models.py:14: in <module>
    from ._decoders import (
.venv/lib/python3.14/site-packages/httpx2/_decoders.py:45: in <module>
    from compression.zstd import ZstdDecompressor, ZstdError
../../.pyenv/versions/3.14.3/lib/python3.14/compression/zstd/__init__.py:29: in <module>
    import _zstd
E   ModuleNotFoundError: No module named '_zstd'
================================================================= short test summary info ==================================================================
ERROR tests/scheduler - ModuleNotFoundError: No module named '_zstd'

Is zstd a hard requirement?

[Kludex]

That's my bad. Let me get to my train and I'll make it optional again.

[Kludex]

#1000