Here's the failure when attempting to add the package...
julia> Pkg.clone("https://github.com/fredrikekre/Literate.jl")
Cloning git-repo `https://github.com/fredrikekre/Literate.jl`
Updating git-repo `https://github.com/fredrikekre/Literate.jl`
[ Info: Path `/Users/robert/.julia/dev/Literate` exists and looks like the correct package, using existing path instead of cloning
Resolving package versions...
ERROR: Unsatisfiable requirements detected for package StatsBase [2913bbd2]:
StatsBase [2913bbd2] log:
├─possible versions are: [0.1.0, 0.2.0-0.2.1, 0.2.3-0.2.10, 0.3.0-0.3.13, 0.4.0-0.4.4, 0.5.0-0.5.3, 0.6.0-0.6.16, 0.7.0-0.7.4, 0.8.0-0.8.3, 0.9.0, 0.10.0, 0.11.0-0.11.1, 0.12.0, 0.13.0-0.13.1, 0.14.0-0.14.1, 0.15.0, 0.16.0-0.16.1, 0.17.0, 0.18.0, 0.19.0-0.19.5, 0.20.0-0.20.1, 0.22.0, 0.23.0-0.23.1, 0.24.0, 0.25.0, 0.26.0] or uninstalled
├─restricted to versions 0.14.0-* by Plots [91a5bcdd], leaving only versions [0.14.0-0.14.1, 0.15.0, 0.16.0-0.16.1, 0.17.0, 0.18.0, 0.19.0-0.19.5, 0.20.0-0.20.1, 0.22.0, 0.23.0-0.23.1, 0.24.0, 0.25.0, 0.26.0]
│ └─Plots [91a5bcdd] log:
│ ├─possible versions are: 0.22.0 or uninstalled
│ └─Plots [91a5bcdd] is fixed to version 0.22.0+
├─restricted to versions 0.25.0 by an explicit requirement, leaving only versions 0.25.0
└─restricted by julia compatibility requirements to versions: 0.26.0 or uninstalled — no versions left
Stacktrace:
[1] #propagate_constraints!#61(::Bool, ::Function, ::Pkg.GraphType.Graph, ::Set{Int64}) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/GraphType.jl:1005
[2] propagate_constraints! at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/GraphType.jl:946 [inlined]
[3] #simplify_graph!#121(::Bool, ::Function, ::Pkg.GraphType.Graph, ::Set{Int64}) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/GraphType.jl:1460
[4] simplify_graph! at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/GraphType.jl:1460 [inlined]
[5] macro expansion at ./logging.jl:317 [inlined]
[6] resolve_versions!(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}, ::Nothing) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/Operations.jl:353
[7] resolve_versions! at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/Operations.jl:316 [inlined]
[8] #add_or_develop#62(::Array{Base.UUID,1}, ::Symbol, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/Operations.jl:1201
[9] #add_or_develop at ./none:0 [inlined]
[10] #add_or_develop#13(::Symbol, ::Bool, ::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:64
[11] #add_or_develop at ./none:0 [inlined]
[12] #develop#19 at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:70 [inlined]
[13] develop at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:70 [inlined]
[14] macro expansion at ./logging.jl:308 [inlined]
[15] clone(::String, ::String) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:468 (repeats 2 times)
[16] top-level scope at none:0