Update src/fileio.jl

Author: oxinabox

src/fileio.jl

@@ -64,7 +64,7 @@ function _convert(
     return join(strs,'\n')
 end
 
-# PNG
+# PNG  (Including for things that can be saved as PNGs like Plots.jl plots)
 function _convert(::Type{<:DataFormat{:PNG}}, data)::AbstractArray{<:Colorant}
     mktempdir() do dir
         filename = File{DataFormat{:PNG}}(joinpath(dir, "inconversion.png"))