try to add ghostscript

jakebeal · jakebeal · commit 53b14a3c8594 · 2019-09-11T09:21:59.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -10,6 +10,10 @@ services:
   - xvfb
 cache:
   - apt
+addons:
+  apt:
+    packages:
+      - ghostscript
 env:
  global:
     - OCTAVE=octave
