Fix: Rename get() to create()

[localheinz]

This PR

• renames FixtureFactory::get() to FixtureFactory::create()

[codecov]

Codecov Report

Merging #189 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #189   +/-   ##
=========================================
  Coverage     97.55%   97.55%           
  Complexity       91       91           
=========================================
  Files            19       19           
  Lines           245      245           
=========================================
  Hits            239      239           
  Misses            6        6           

Impacted Files	Coverage Δ	Complexity Δ
src/FieldDefinition/Reference.php	100.00% <100.00%> (ø)	3.00 <0.00> (ø)
src/FixtureFactory.php	96.36% <100.00%> (ø)	39.00 <9.00> (ø)

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