Boaz Blankrot

This should be easy, since markdig already supports this: just `using Markdig.Extensions.TaskLists` and maybe an update to the newest version.

This change can be implemented by, for example, changing the following lines in `bessel.jl`: ```julia ccall((:zbesh_,openspecfun), Cvoid, (Ref{Float64}, Ref{Float64}, Ref{Float64}, Ref{Int32}, Ref{Int32}, Ref{Int}, Ref{Float64}, Ref{Float64}, Ref{Int32}, Ref{Int32}), real(z), imag(z), nu,...