Removed sudo key from Travis CI config

[freemanjp]

The key sudo has no effect anymore.

[codecov]

Codecov Report

Merging #320 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #320   +/-   ##
=========================================
  Coverage     83.26%   83.26%           
  Complexity       79       79           
=========================================
  Files            16       16           
  Lines           514      514           
  Branches         72       72           
=========================================
  Hits            428      428           
  Misses           40       40           
  Partials         46       46           

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