Add category to apns-async calls

[aaronn]

APNS has the concept of a category and this was lost in the addition of the async version of this package with the addition of apns-async. This re-adds category support.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.43%. Comparing base (44977b1) to head (3729071).
Report is 52 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #758      +/-   ##
==========================================
+ Coverage   70.39%   72.43%   +2.04%     
==========================================
  Files          27       29       +2     
  Lines        1101     1237     +136     
  Branches      180      204      +24     
==========================================
+ Hits          775      896     +121     
- Misses        288      298      +10     
- Partials       38       43       +5     

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[aaronn]

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