Remove uvicorn (and hupper) dependencies

Refs https://github.com/simonw/datasette/issues/850

setup.py

@@ -47,10 +47,8 @@ setup(
         "click~=7.1.1",
         "click-default-group~=1.2.2",
         "Jinja2>=2.10.3,<2.12.0",
-        "hupper~=1.9",
         "pint~=0.9",
         "pluggy~=0.13.0",
-        "uvicorn~=0.11",
         "aiofiles>=0.4,<0.6",
         "janus>=0.4,<0.6",
         "asgi-csrf>=0.5.1",