Release version 1.9

[kittinunf]

What's in this PR?

• Gson module support by @KucherenkoIhor
• Feature/logging response by @KucherenkoIhor
• Fix for Could not initialize class com.github.kittinunf.fuel.core.FuelManager #150 by @ParkerK

[codecov]

Codecov Report

Merging #201 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #201   +/-   ##
=========================================
  Coverage     63.44%   63.44%           
  Complexity      157      157           
=========================================
  Files            32       32           
  Lines           870      870           
  Branches        150      150           
=========================================
  Hits            552      552           
  Misses          228      228           
  Partials         90       90

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