fix: Cannot build for aws lambda

[appleboy]

fix: #432

[codecov-io]

Codecov Report

Merging #433 into master will not change coverage.
The diff coverage is 78.04%.

@@           Coverage Diff           @@
##           master     #433   +/-   ##
=======================================
  Coverage   82.86%   82.86%           
=======================================
  Files          19       20    +1     
  Lines        1360     1360           
=======================================
  Hits         1127     1127           
  Misses        190      190           
  Partials       43       43

Impacted Files	Coverage Δ
gorush/server.go	85% <ø> (+2.35%)	⬆️
gorush/server_normal.go	78.04% <78.04%> (ø)

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