add auto reload support

[codecov[bot]]

Codecov Report

Merging #27 (6ec381e) into master (8a4cd41) will increase coverage by 0.79%. Report is 5 commits behind head on master. The diff coverage is 87.25%.

:exclamation: Current head 6ec381e differs from pull request most recent head 282f669. Consider uploading reports for the commit 282f669 to get more accurate results

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   91.27%   92.07%   +0.79%     
==========================================
  Files          19       19              
  Lines        1720     1830     +110     
==========================================
+ Hits         1570     1685     +115     
+ Misses        150      145       -5     

Files	Coverage Δ
tremolo/__main__.py	90.90% <100.00%> (+0.21%)	:arrow_up:
tremolo/lib/connections.py	100.00% <100.00%> (ø)
tremolo/lib/contexts.py	100.00% <ø> (ø)
tremolo/lib/h1parser/parse_header.py	94.44% <100.00%> (+0.32%)	:arrow_up:
tremolo/lib/pools.py	100.00% <ø> (ø)
tremolo/lib/websocket.py	93.06% <100.00%> (+0.06%)	:arrow_up:
tremolo/asgi_lifespan.py	83.67% <0.00%> (+10.20%)	:arrow_up:
tremolo/lib/http_protocol.py	88.77% <91.66%> (+1.05%)	:arrow_up:
tremolo/lib/http_response.py	94.01% <92.50%> (-0.90%)	:arrow_down:
tremolo/tremolo.py	92.14% <83.89%> (+1.36%)	:arrow_up:

... and 2 files with indirect coverage changes

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