Update news.json

assets/javascripts/news.json

@@ -1,4 +1,8 @@
 [
+  [
+    "2019-01-13",
+    "New documentation: <a href=\"/gnuplot/\">Gnuplot</a>"
+  ],
   [
     "2019-10-26",
     "New documentation: <a href=\"/sequelize/\">Sequelize</a>"