Update Travis build config

The sudo key is deprecated and doesn't do anything anymore.

Adding the "os" key with default value "linux" which was assumed to the build config.

diff --git a/.travis.yml b/.travis.yml
index 2c991431bf9cdb992d2560e835681d0f21c26066..5d3f4c0e6d1a5e133d7353607c249d15be03d300 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ git:
 
 dist: xenial
 language: c
-sudo: required
+os: linux
 addons:
   apt:
     packages: