[PATCH] travis-ci: no longer use containers

Travis CI will soon deprecate the container-based infrastructure
enabled by `sudo: false` in ce59dffb34190e780be2fa9f449f842cadee9753.

More info:
https://blog.travis-ci.com/2018-10-04-combining-linux-infrastructures

Signed-off-by: Sebastian Staudt <redacted>
---
 .travis.yml | 2 --
 1 file changed, 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 4d4e26c9df..8d2499739e 100644
--- a/.travis.yml
+++ b/.travis.yml

@@ -1,7 +1,5 @@
 language: c

-sudo: false
-
 cache:
   directories:
     - $HOME/travis-cache
--

2.19.1