Reduce ABC size for parse_date_range
Reduce ABC size for parse_date_range

Fixes CodeClimate/RuboCop offense:
Assignment Branch Condition size for parse_date_range is too high. [<7, 17, 9> 20.47/20]

MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer