Add missing environment package.

gaomy3832 · Feb 4, 2019 · e174f98 · e174f98
1 parent d58ab21
commit e174f98
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -14,6 +14,7 @@ addons:
             - dvipng
             - texlive
             - texlive-latex-extra
+            - python-tk
             - xvfb
 
 cache: