Update APNS.js

[flovilmart]

Fixes #88

[codecov]

Codecov Report

Merging #89 into master will increase coverage by 0.78%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master    #89      +/-   ##
========================================
+ Coverage   99.21%   100%   +0.78%     
========================================
  Files           5      5              
  Lines         254    254              
========================================
+ Hits          252    254       +2     
+ Misses          2      0       -2

Impacted Files	Coverage Δ
src/APNS.js	100% <100%> (+1.72%)	⬆️

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[theill]

I've checked the contract in 'apn' module and this is the correct change required.

[flovilmart]

Thanks @theill !