Fix flaky test testSimpleHTTPClient

[pushkarnk]

No description provided.

[codecov-io]

Codecov Report

Merging #20 into master will decrease coverage by 0.97%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
- Coverage   76.76%   75.78%   -0.98%     
==========================================
  Files          19       19              
  Lines         921      921              
==========================================
- Hits          707      698       -9     
- Misses        214      223       +9

Flag	Coverage Δ
#KituraNIO	75.78% <ø> (-0.98%)	⬇️

Impacted Files	Coverage Δ
Sources/KituraNIO/ClientRequest.swift	70.33% <0%> (-3%)	⬇️

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