Event localizer improvement

[the-spectator]

Related to #721

Summary

This PR adds #to_s method to AASM::Core::Event so we can directly use Model.aasm.human_event_name(event_object).
Following is the relevant code with addition to #to_s enables us to pass event_object.

aasm/lib/aasm/localizer.rb

Line 5 in ea04160

list << :"#{i18n_scope(klass)}.events.#{i18n_klass(ancestor)}.#{event}"

[codeclimate]

Code Climate has analyzed commit 3748cc0 and detected 0 issues on this pull request.

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[codecov-io]

Codecov Report

Merging #723 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #723   +/-   ##
=======================================
  Coverage   95.33%   95.33%           
=======================================
  Files          35       35           
  Lines        1242     1244    +2     
=======================================
+ Hits         1184     1186    +2     
  Misses         58       58           

Impacted Files	Coverage Δ
lib/aasm/core/event.rb	97.80% <100.00%> (+0.04%)	⬆️

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[anilmaurya]

Thank you for contributing @the-spectator