Fixed code example typo - renamed param name 'handlers' to 'handler'

[ileacristian]

Fixed a typo in a code example. The old code would throw a runtime exception: ERROR [2018-04-22 23:55:28.625972] (Bob): An exception occurred while running! (subscribe() got an unexpected keyword argument 'handlers')

[codecov[bot]]

Codecov Report

Merging #298 into master will not change coverage. The diff coverage is n/a.

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##           master     #298   +/-   ##
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  Coverage   99.24%   99.24%           
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  Files          26       26           
  Lines        3588     3588           
  Branches      257      257           
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  Hits         3561     3561           
  Misses         15       15           
  Partials       12       12

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[Peque]

Woops... Nice catch! :blush:

Would you mind renaming the commit message to:

Fix example with wrong `handler` parameter name

?

I can do that for you if you want. :+1:

[Peque]

@ileacristian Thanks a lot! :smile: