Fix typo in pattern_search/base.rb
Fix typo in pattern_search/base.rb

I messed up Commit #9705aa3

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