Bug fix for #63

[eandersson]

• Properly wait until the inbound queue is empty when break_on_empty is set.
• Disable broken Python 3.8 gate.

[codecov-io]

Codecov Report

Merging #64 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #64   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          29     29           
  Lines        1752   1754    +2     
  Branches      260    261    +1     
=====================================
+ Hits         1752   1754    +2

Impacted Files	Coverage Δ
amqpstorm/channel.py	100% <100%> (ø)	⬆️
amqpstorm/__init__.py	100% <100%> (ø)	⬆️

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