Set utf8 encoding on gnuplot start

.travis.yml

@@ -7,14 +7,14 @@ os:
 
 julia:
   - 1.2
-  - nightly
+#  - nightly
 
 notifications:
   email: false
 
-matrix:
+#matrix:
-  allow_failures:
+#  allow_failures:
-    - julia: nightly
+#    - julia: nightly
 
 addons:
   apt:

ChangeLog.md

@@ -1,3 +1,11 @@
+# Version 1.3.1 (not yet released)
+- Bugfix:
+	* Multiplot were not displayed in Jupyter (#25);
+
+	* `gpvars()` fails if gnuplot character encoding is utf8
+      (#24);
+
+
 # Version 1.3.0 (released on: Apr. 29, 2020)
 
 - New features:

src/Gnuplot.jl

@@ -549,6 +549,11 @@ function GPSession(sid::Symbol)
     if options.term == ""
         options.term = terminal()
     end
+
+    # The stderr of the gnuplot process goes to Julia which can parse
+    # UTF8 characters (regardless of the terminal).
+    gpexec("set encoding utf8")
+
     return out
 end