load_ply error

[Rodolfo Figueroa Soriano]

load_ply causes an error on Julia 1.0.3. This is due to the replace function syntax on line 206 of types.jl:
headerstr = replace(strip(headerstr), "\n", "\n ")
should instead be:
headerstr = replace(strip(headerstr), "\n"=>"\n ")

[Rodolfo Figueroa Soriano]

Created PR instead