Update dependencies issue #40

[nelsonic]

@SimonLab dunno if you want to do this update yourself or if it's OK that you are the reviewer ... 💭

• [x] update dependencies in mix.exs to latest :httpoison #40
• [x] update version of Elixir in .travis.yml to latest #40

This way this package is in-line with elixir-auth-google ✅

[codecov[bot]]

Codecov Report

Merging #41 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #41   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          11     11           
=====================================
  Hits           11     11

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