rotational-cipher: Instructions are missing the bonus tasks

[SaschaMann]

See https://github.com/exercism/configlet for docs on how to fix this.

[Jollywatt]

I believe the bonus task tests aren't being run because the isdefined check

# Bonus A
if isdefined(Main, Symbol("@R13_str"))
    @eval @testset "Bonus A: string literal R13" begin

always returns false. This is because user's code gets evaluated in the module

@__MODULE__() = ExercismTestReports

instead of Main, as revealed by @show @__MODULE__.

So the fix is:

# Bonus A
if isdefined(ExercismTestReports, Symbol("@R13_str")) # user code is evaluated in ExercismTestReports module
    @eval @testset "Bonus A: string literal R13" begin

[kerolloz]

@SaschaMann I guess this issue should be closed.