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.PlotElements object, containing commands, data and plot specifications in a single argument;
- The recipe() function can be extended to register new implicit recipes to display input data;
- The linetypes function now accept the lw, ps (to set the line width and point size respectively), and the dashed (to use dashed patterns in place of solid lines) keywords;
- The new Gnuplot.options.reset::Vector{String} field allows to set initialization commands to be executed when a session is reset. Unlike Gnuplot.options.init, these commands are saved in the session and can be saved into a script;
- New functions: gpvars() to retrieve all gnuplot variables, gpmargins() to retrieve current plot margins (in screen coordinates, gpranges() to retrieve current plot axis ranges;
- New keywords for @gp and @gsp: lmargin, rmargin, bmargin, tmargin, margins, to set plot margins;
New recipes:
- to display histograms (as returned by hist());
- to display images;
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)