Allow service tickets on proxyValidate

[dlundgren]

Fixes #56 in that it allows service tickets to be validated when method: proxyValidate is fed to TicketValidatorTrait::validate.

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 66.63%. Comparing base (e7801a9) to head (9d28b70).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #57      +/-   ##
============================================
- Coverage     66.72%   66.63%   -0.09%     
- Complexity      351      353       +2     
============================================
  Files            26       26              
  Lines          1190     1190              
============================================
- Hits            794      793       -1     
- Misses          396      397       +1     

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