Added ChangeLog.md

ChangeLog.md

@@ -0,0 +1,27 @@
+# Version 1.2.0
+git-tree-sha1: master
+released on: 
+
+- New features:
+	* REPL mode: a new `Gnuplot.repl_init()` function is available to
+      install a gnuplot REPL;
+
+	* `@gp` and `@gsp` now accepts a `Gnuplot.DataSet` object, to
+	allow customized data input;
+
+- 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 a copy
+	is made and 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 
+git-tree-sha1: d62f8713b2e49bce9ef37bd21b80c4297d316915
+released on: Apr. 09, 2020
+
+- First production ready version;
+- Completed documentation and example gallery;