ci: Track stable and beta in place of specific versions

kamalmarhubi · kamalmarhubi · commit fad3393a735b · 2016-01-13T16:04:34.000-05:00
refs nix-rust#238
diff --git a/.travis.yml b/.travis.yml
@@ -2,8 +2,9 @@
 sudo: false
 language: rust
 rust:
+  - stable
+  - beta
   - nightly
-  - 1.1.0
 
 os:
   - linux
