Update Travis setting

termoshtt · termoshtt · commit 930f8af0c727 · 2017-05-25T16:32:07.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,4 @@
 language: rust
-sudo: required
 
 rust:
   - stable
@@ -20,9 +19,6 @@ script:
 
 addons:
   apt:
-    sources:
-      - kubuntu-backports
-
     packages:
       - cmake
       - gfortran
