use nightly rust

steveklabnik · steveklabnik · commit ef5de6bfea5d · 2018-05-03T14:59:47.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,6 @@
 language: rust
 cache: cargo
+rust: nightly
 before_script:
   - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
   - (test -x $HOME/.cargo/bin/mdbook || cargo install mdbook)
