Fixup

[lovelydinosaur]

>>> import httpx
>>> r = httpx.get('https://www.httpbin.org/json')
>>> r.content['slideshow']['slides'][0]
{'title': 'Wake up to WonderWidgets!', 'type': 'all'}

Should this be neatly defined individual PRs? Yes it should.
Reality?... just pushing on, getting things into shape...

• First pass on redirects.
• JSON data access.
• .content in tests.