`gplothtml` not working

See error below when trying to plot a graph from the REPL to html (note: this is on a Windows machine, so it should work):

```julia
julia> using GraphPlot

julia> gplothtml(net)
┌ Warning: Showing plots is not supported on OS NT
└ @ GraphPlot C:\Users\ub01382\.julia\packages\GraphPlot\pvheh\src\plot.jl:241
```