Remove redundant sudo key and specify os in travis config

diff --git a/.travis.yml b/.travis.yml
index 0f801cb71121a93434668d6d59474813e2628fc0..44fb7b62e7506ead7f01b392256e6ec000add712 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
-sudo: false
 language: ruby
+os: linux
 dist: bionic
 cache: bundler
 services: