Use standard whitespace for grains
Use standard whitespace for grains

Replace tabs with 2 spaces per community standards, and make blank lines
consistent with other exercises.

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