Gnuplot v2.4.0 released

After approximately a bazillion years since its last released, pleased
to announce the release of v2.4.0
Mostly due to patches submitted by people, thanks github!

changelog:

2.4.0

  • Allow for 3D plots, fix examples. Thanks everybody!

-roger-

details on the gem here: https://github.com/rdp/ruby_gnuplot