Maybe fix curlString

[SleeplessByte]

Please try this @NikkyAI

Description

Type of change

Check all that apply

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (a change which changes the current internal or external interface)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation, if necessary
• My changes generate no new compiler warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Inspect the bytecode viewer, including reasoning why

[NikkyAI]

it seems to work now, i will add some regression tests later to verify it too

[iNoles]

Some how, Travis CI removed sdkmanager.

[codecov]

Codecov Report

Merging #664 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #664      +/-   ##
============================================
+ Coverage     71.39%   71.44%   +0.05%     
+ Complexity      297      296       -1     
============================================
  Files            57       58       +1     
  Lines          1489     1492       +3     
  Branches        192      192              
============================================
+ Hits           1063     1066       +3     
  Misses          334      334              
  Partials         92       92

Impacted Files	Coverage Δ	Complexity Δ
...github/kittinunf/fuel/core/requests/DefaultBody.kt	87.17% <ø> (-0.33%)	18 <0> (-1)
...ithub/kittinunf/fuel/core/extensions/Formatting.kt	90% <100%> (+1.11%)	0 <0> (ø)	⬇️
...main/kotlin/com/github/kittinunf/fuel/core/Body.kt	100% <100%> (ø)	0 <0> (?)
...hub/kittinunf/fuel/core/requests/RepeatableBody.kt	83.33% <100%> (+1.51%)	8 <1> (+1)	⬆️

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[NikkyAI]

💯