Adding --strict-markers for pytest

[tomaszdrozdz]

No description provided.

[tomaszdrozdz]

@ahopkins @myusko - please take a look.

[myusko]

@tomaszdrozdz Tests still failing, seems like we need to add markers = asyncio to tox.ini file.

cc @ahopkins

[codecov]

Codecov Report

Merging #1924 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1924      +/-   ##
==========================================
+ Coverage   92.09%   92.19%   +0.09%     
==========================================
  Files          27       27              
  Lines        3100     3100              
  Branches      555      555              
==========================================
+ Hits         2855     2858       +3     
+ Misses        171      169       -2     
+ Partials       74       73       -1     

Impacted Files	Coverage Δ
sanic/server.py	79.92% <0.00%> (+0.56%)	⬆️

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