Use self:: instead of static::

[AydinHassan]

No description provided.

[codecov-io]

Codecov Report

Merging #118 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #118   +/-   ##
=========================================
  Coverage     96.87%   96.87%           
  Complexity      341      341           
=========================================
  Files            23       23           
  Lines          1057     1057           
=========================================
  Hits           1024     1024           
  Misses           33       33

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