minor change to SegyStruct
minor change to SegyStruct

SeismicJulia/Seismic.jl,fercarozzi/Seismic.jl,JuliaPackageMirrors/Seismic.jl,WneleiGao/Seismic.jl,aaronstanton/Seismic.jl,juanisabbione/Seismic.jl,fercarozzi/myseismicjulia