chore(gorush): add timeout for http client

[appleboy]

dispatch feedback url

See: #449

[codecov-io]

Codecov Report

Merging #473 into master will increase coverage by 0.1%.
The diff coverage is 73.33%.

@@            Coverage Diff            @@
##           master     #473     +/-   ##
=========================================
+ Coverage   80.81%   80.92%   +0.1%     
=========================================
  Files          20       20             
  Lines        1423     1431      +8     
=========================================
+ Hits         1150     1158      +8     
  Misses        220      220             
  Partials       53       53

Impacted Files	Coverage Δ
gorush/notification_apns.go	84.5% <0%> (ø)	⬆️
gorush/notification_fcm.go	79.48% <0%> (ø)	⬆️
config/config.go	94.11% <100%> (+0.07%)	⬆️
gorush/feedback.go	90.9% <100%> (+4.24%)	⬆️

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