lower-cases atbash-cipher alphabet encoded example
lower-cases atbash-cipher alphabet encoded example

This matches the behavior of the Ruby implementation.

[#663]

rpottsoh/x-common,Vankog/problem-specifications,Vankog/problem-specifications,kgengler/x-common,jmluy/x-common,wobh/x-common,exercism/x-common,petertseng/x-common,jmluy/x-common,bennn/x-common,ErikSchierboom/x-common,jmluy/x-common,exercism/x-common,ErikSchierboom/x-common,rpottsoh/x-common,ekse/exercism-common,petertseng/x-common,kgengler/x-common