Update readme

[mohabusama]

Update readme with generator example

[codecov[bot]]

Codecov Report

Merging #14 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff           @@
##           master     #14   +/-   ##
======================================
  Coverage    97.9%   97.9%           
======================================
  Files           7       7           
  Lines         239     239           
======================================
  Hits          234     234           
  Misses          5       5

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

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[vetinari]

:+1:

[elgris]

👍

[mohabusama]

👍

[mohabusama]

👍

[elgris]

👍