Use the language "minimal"

gmr · gmr · commit 8effec9b1e7f · 2018-11-30T11:17:15.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ dist: xenial
 services:
   - docker
 
-language: python
+language: minimal
 
 env:
   global:
