Update .travis.yml

[dereuromark]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@304dbe6). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #1   +/-   ##
=========================================
  Coverage          ?   97.87%           
  Complexity        ?       16           
=========================================
  Files             ?        4           
  Lines             ?       47           
  Branches          ?        0           
=========================================
  Hits              ?       46           
  Misses            ?        1           
  Partials          ?        0

Impacted Files	Coverage Δ	Complexity Δ
src/View/Helper/HighlighterHelper.php	96% <ø> (ø)	10 <0> (?)
src/Highlighter/Highlighter.php	100% <ø> (ø)	3 <0> (?)

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