Add a safer version for extract span

[mohabusama]

• Safer extract_span
• Add util remove span from kwargs

[codecov[bot]]

Codecov Report

Merging #13 into master will increase coverage by 0.06%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #13      +/-   ##
=========================================
+ Coverage   97.84%   97.9%   +0.06%     
=========================================
  Files           7       7              
  Lines         232     239       +7     
=========================================
+ Hits          227     234       +7     
  Misses          5       5

Impacted Files	Coverage Δ
opentracing_utils/__init__.py	100% <100%> (ø)	:arrow_up:
opentracing_utils/span.py	100% <100%> (ø)	:arrow_up:

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[vetinari]

:+1:

[mohabusama]

👍