ci - coverage

[commonism]

• flags for core & tests
• coverage for optional libraries
• exclude typing boilerplate

[codecov]

Codecov Report

Merging #184 (946b022) into master (7ffce08) will increase coverage by 1.79%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
+ Coverage   92.69%   94.49%   +1.79%     
==========================================
  Files          86       85       -1     
  Lines        6738     6668      -70     
==========================================
+ Hits         6246     6301      +55     
+ Misses        492      367     -125     

Flag	Coverage Δ
core	93.80% <ø> (?)
tests	95.49% <100.00%> (?)
unittests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
tests/apiv1_test.py	100.00% <100.00%> (ø)
tests/apiv2_test.py	82.14% <100.00%> (ø)
tests/content_length_test.py	100.00% <100.00%> (ø)
tests/debug_test.py	100.00% <100.00%> (ø)
tests/stream_test.py	98.26% <100.00%> (ø)
tests/tls_test.py	96.50% <100.00%> (ø)

... and 24 files with indirect coverage changes

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