[2.x] Prefer arrow functions over anonymous functions.

[r-kujawa]

What does this PR do? 🤖

• Replaces standard anonymous functions with arrow functions for single liner return statements.

Does this relate to any issue? 🔗

Closes #41

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.33%. Comparing base (081e541) to head (babd000).

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #49      +/-   ##
============================================
+ Coverage     26.84%   27.33%   +0.48%     
  Complexity       67       67              
============================================
  Files            14       14              
  Lines           149      150       +1     
============================================
+ Hits             40       41       +1     
  Misses          109      109              

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