only do travis on nightly

steveklabnik · steveklabnik · commit 1e2b93f5c9bf · 2017-03-15T14:53:52.000-04:00
it's the nomicon, duh 👻
diff --git a/.travis.yml b/.travis.yml
@@ -4,8 +4,6 @@ cache: cargo
 
 rust:
   - nightly
-  - beta
-  - stable
 
 before_script:
   - (cargo install mdbook --git https://github.com/azerupi/mdBook.git --force || true)
