Psalm 1 + Update StyleCI configuration

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[codecov]

Codecov Report

Base: 90.80% // Head: 92.35% // Increases project coverage by +1.55% 🎉

Coverage data is based on head (aaa882d) compared to base (875056b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #34      +/-   ##
============================================
+ Coverage     90.80%   92.35%   +1.55%     
  Complexity       60       60              
============================================
  Files             4        4              
  Lines           250      301      +51     
============================================
+ Hits            227      278      +51     
  Misses           23       23              

Impacted Files	Coverage Δ
src/AssignmentsStorage.php	98.71% <100.00%> (+0.33%)	⬆️
src/ItemsStorage.php	97.12% <100.00%> (+0.96%)	⬆️

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[arogachev]

Fine except some annotations are not Psalm specific.