Fix #40

[smurfix]

Defer creating an asyncio coroutine some of these need an actual asyncio context (=task)

[njsmith]

Pasting my review from chat:

hmm... I was thinking it was harder than that, because the real asyncio code actually does something different... the code inside proc.__call__ runs in the parent task's context, not necessarily the same task where __await__ gets called and iterated

but I guess you're simulating it always happening inside a task, which is probably what the aiohttp devs were expecting anyway if they didn't think of the create_task(some_function) case, so... guess that works :-)

I'd do a more detailed comment though because this totally something we're going to scratch our heads over later

ideally citing a specific example of a function that breaks without it

[njsmith]

Probably could use a test case too

[njsmith]

And a newsfragment

[codecov[bot]]

Codecov Report

Merging #41 into master will decrease coverage by 0.11%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
- Coverage   73.45%   73.33%   -0.12%     
==========================================
  Files          11       11              
  Lines        1262     1264       +2     
  Branches      165      165              
==========================================
  Hits          927      927              
- Misses        281      282       +1     
- Partials       54       55       +1

Impacted Files	Coverage Δ
trio_asyncio/_version.py	100% <100%> (ø)	:arrow_up:
trio_asyncio/adapter.py	76.15% <100%> (+0.37%)	:arrow_up:
trio_asyncio/handles.py	81.3% <0%> (-1.87%)	:arrow_down:

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