[#69] Adapting to the new Auth mechanism

[ferigis]

[close #69]

[codecov-io]

Codecov Report

Merging #70 into master will increase coverage by 0.14%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   96.46%   96.61%   +0.14%     
==========================================
  Files          23       23              
  Lines         283      295      +12     
==========================================
+ Hits          273      285      +12     
  Misses         10       10

Impacted Files	Coverage Δ
lib/poa_agent/plugins/transfers/http/rest.ex	100% <100%> (ø)	⬆️

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[coveralls]

Coverage increased (+0.1%) to 96.61% when pulling cd428ac on ferigis.69.new_auth_method into f0047ac on master.