CI(travis): remove deprecated `sudo` keyword

diff --git a/.travis.yml b/.travis.yml
index 68a8bace73e7e1e9c45be66f6f62028463e42a03..f353ef28d7b7523a2531a74309ce9be95bcebdac 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,9 +6,6 @@ branches:
   only:
     - master
 
-# Prefer docker containers
-sudo: required
-
 language: python
 
 python: