Version 1.2.0 (not yet released)

New features:
- REPL mode: a new Gnuplot.repl_init() function is available to install a gnuplot REPL;
- @gp and @gsp now accepts a Gnuplot.PlotRecipe object, collect commands, data and plot specifications in a single argument;
- The plotrecipe function can be extended to register new implicit recipes to display input data;
- The linetypes function now accept the lw and ps keywords (to set the line width and point size respectively), and the dashed keyword (to use dashed patterns in place of solid lines);
- The new Gnuplot.options.reset::Vector{String} field allows to set initialization commands to be executed when a session is reset. Unlike Gnuplot.options.reset, these commands are saved in the session and can be dumped to a script;
Bugfix:
- When a Vector{String} is passed to driver() it used to be modified, and couldn't be used again in a second call. Now the original is preserved;
- contourlines() used to return a single blanck line to distinguish iso-contour lines, and this may cause problems in 3D plot. Now two blanck lines are returned;

Version 1.1.0 (released on: Apr. 09, 2020)