migrates to modern coroutine syntax.

[wanderxjtu]

Migrates to `async def/await' syntax, drop support on python3.4.

Quote from python doc

Generator-based Coroutines ... Deprecated since version 3.8, will be removed in version 3.10: Use async def instead.

[codecov-io]

Codecov Report

Merging #6 into master will increase coverage by 0.77%. The diff coverage is 72.09%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage      83%   83.77%   +0.77%     
==========================================
  Files          58       58              
  Lines        1800     1824      +24     
==========================================
+ Hits         1494     1528      +34     
+ Misses        306      296      -10

Impacted Files	Coverage Δ
anthunder/listener/aio_listener.py	75.82% <65.21%> (+4.94%)	:arrow_up:
anthunder/client/aio_client.py	64.67% <80%> (-0.04%)	:arrow_down:
anthunder/command/heartbeat.py	100% <0%> (ø)	:arrow_up:
anthunder/command/fail_response.py	100% <0%> (ø)	:arrow_up:
tests/test_aio_listener_client.py	98.94% <0%> (+0.02%)	:arrow_up:
tests/mysockpool_test/test_poolman.py	98.18% <0%> (+0.03%)	:arrow_up:
anthunder/protocol/_sofa_header.py	95.91% <0%> (+0.08%)	:arrow_up:
mytracer/_rpc_id.py	92.85% <0%> (+0.17%)	:arrow_up:
anthunder/protocol/_package_base.py	98.5% <0%> (+0.2%)	:arrow_up:
... and 7 more

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