Silence validation warning

c-x-berger · c-x-berger · commit 9a768191298a · 2020-01-07T08:38:58.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -17,5 +17,6 @@ arch:
 cache: cargo
 dist: bionic
 language: rust
+os: linux
 rust: 
   - stable
