fix: change private to protected

[czy88840616]

No description provided.

[codecov-io]

Codecov Report

Merging #49 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #49      +/-   ##
=========================================
+ Coverage   69.09%   69.1%   +0.01%     
=========================================
  Files          69      69              
  Lines        1925    1926       +1     
  Branches      181     182       +1     
=========================================
+ Hits         1330    1331       +1     
  Misses        564     564              
  Partials       31      31

Impacted Files	Coverage Δ
packages/serverless-invoke/src/core.ts	70.96% <ø> (ø)	⬆️
packages/faas/src/starter.ts	81.39% <100%> (+0.21%)	⬆️

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