Add sphinx dependency

AA-Turner · AA-Turner · commit 16a5404fc152 · 2020-04-26T03:41:11.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,7 +7,7 @@ dist: xenial
 cache: pip
 
 before_install:
-    - pip install docutils
+    - pip install docutils sphinx
 script:
     - make -j$(nproc)
 
