Fix: Remove callable support for sequence

[localheinz]

This PR

• removes callable support for sequences

[codecov]

Codecov Report

Merging #185 into master will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #185      +/-   ##
============================================
- Coverage     97.53%   97.42%   -0.11%     
+ Complexity       89       86       -3     
============================================
  Files            19       19              
  Lines           243      233      -10     
============================================
- Hits            237      227      -10     
  Misses            6        6              

Impacted Files	Coverage Δ	Complexity Δ
src/FieldDefinition.php	100.00% <100.00%> (ø)	6.00 <2.00> (-3.00)
src/FixtureFactory.php	96.36% <100.00%> (ø)	39.00 <0.00> (ø)

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