don't send 100-continue until the body has been read from #139
+174
−52
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closes #135. if a client says it expects 100-continue and we never read the body, we never send 100 continue and the client will have the option not to send a body.
this is implemented using a
ReadNotifier
which forwards BufRead and Read and sends a message on an async channel on first read. a task is spawned for each request which awaits that message and sends 100-continue.the approach to testing might have been overkill for this pr, but hopefully sets us up to do other complex testing with async-h1