Build failure of master (v0.10.2) on julia 1.0: `Markdown not defined`

[jleugeri]

] dev PlotlyJS on Julia 1.0.0 gives me:

┌ Error: Error building PlotlyJS:
...
│ ERROR: LoadError: LoadError: UndefVarError: Markdown not defined
│ Stacktrace:
│ [1] include at ./boot.jl:317 [inlined]
│ [2] include_relative(::Module, ::String) at ./loading.jl:1038
│ [3] include(::Module, ::String) at ./sysimg.jl:29
│ [4] include(::String) at ./client.jl:388
│ [5] top-level scope at none:0
│ [6] include at ./boot.jl:317 [inlined]
│ [7] include_relative(::Module, ::String) at ./loading.jl:1038
│ [8] include(::Module, ::String) at ./sysimg.jl:29
│ [9] include(::String) at ./client.jl:388
│ [10] top-level scope at none:0
│ in expression starting at /home/jpg/.julia/dev/PlotlyJS/deps/make_schema_docs.jl:3
│ in expression starting at /home/jpg/.julia/dev/PlotlyJS/deps/build.jl:10
└ @ Pkg.Operations ~/julia/usr/share/julia/stdlib/v1.0/Pkg/src/Operations.jl:1068

Culprit seems to be Base.Markdown in deps/make_schema_docs.jl.

Should this just be Markdown?

[jleugeri]

Also, Associative throws some UndefVarErrors in make_schema_docs.jl as well :

Associative has been deprecated in favor of AbstractDict #25012

[jleugeri]

Also, Nullable is used 20 times in make_schema_docs.jl. I guess that needs some work.