Fix incorrect filename in leap_test
Fix incorrect filename in leap_test

exercism/xelixir,Egogre/xelixir,elasticdog/xelixir,parkerl/xelixir,victorlcampos/xelixir,cezarykosko/xelixir,wobh/xelixir,henrik/xelixir,montague/xelixir,tjcelaya/xelixir