Drop support for PHP 5.4 and PHP 5.5

[aik099]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.73%. Comparing base (7f80da0) to head (bde3b3e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #109      +/-   ##
============================================
- Coverage     98.06%   97.73%   -0.33%     
  Complexity      498      498              
============================================
  Files            29       29              
  Lines          1811     1460     -351     
============================================
- Hits           1776     1427     -349     
+ Misses           35       33       -2     

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