fixed content_type typo

[nggit]

No description provided.

[codecov]

Codecov Report

Merging #31 (ca743fc) into master (8a4cd41) will increase coverage by 0.89%.
Report is 8 commits behind head on master.
The diff coverage is 88.05%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   91.27%   92.17%   +0.89%     
==========================================
  Files          19       19              
  Lines        1720     1827     +107     
==========================================
+ Hits         1570     1684     +114     
+ Misses        150      143       -7     

Files	Coverage Δ
tremolo/__main__.py	95.45% <100.00%> (+4.75%)	⬆️
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%)	⬆️
tremolo/lib/pools.py	100.00% <ø> (ø)
tremolo/lib/websocket.py	93.06% <100.00%> (+0.06%)	⬆️
tremolo/lib/tasks.py	84.61% <75.00%> (-6.30%)	⬇️
tremolo/asgi_lifespan.py	83.67% <0.00%> (+10.20%)	⬆️
tremolo/lib/http_protocol.py	88.77% <92.00%> (+1.05%)	⬆️
tremolo/lib/http_response.py	94.01% <92.85%> (-0.90%)	⬇️
... and 1 more

... and 2 files with indirect coverage changes

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