bug: Update APNs APS block

[jrconlin]

Closes #1076

[codecov-io]

Codecov Report

Merging #1077 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1077      +/-   ##
==========================================
+ Coverage   99.71%   99.71%   +<.01%     
==========================================
  Files          58       58              
  Lines        9131     9160      +29     
==========================================
+ Hits         9105     9134      +29     
  Misses         26       26

Impacted Files	Coverage Δ
autopush/tests/test_router.py	100% <ø> (ø)	⬆️
autopush/router/apnsrouter.py	100% <ø> (ø)	⬆️
autopush/tests/test_integration.py	100% <100%> (ø)	⬆️
autopush/router/gcmclient.py	100% <0%> (ø)	⬆️

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