Use of Formatting.jl

[ScottPJones]

It looks like Formatting.jl (which is not currently being maintained) is no longer needed as a dependency for this package.
I was investigating changing it to use Format.jl (which has fixed most all of the issues with Formatting.jl), but the one place it was being used was in src/reporting/report.jl, but that was removed about 2 years ago.

[MichelJuillard]

Thanks @ScottPJones for spotting this obsolete dependency. Fixed with commit e273f2f