Enhance stuffs

[peter279k]

Changed log

• Add php-7.3 test on Travis CI build.
• According to the PHPUnit Fixtures reference, the PHPUnit\Framework\TestCase::setUp should be protected, not public.

[codecov-io]

Codecov Report

Merging #4 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master     #4   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity       70     70           
=======================================
  Files             2      2           
  Lines           143    143           
=======================================
  Hits            143    143

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[adhocore]

thanks :)