deploy fix

Author: sn99

.travis.yml

@@ -1,16 +1,16 @@
 language: rust
-sudo: required
+sudo: false
 
 cache:
-- cargo
+  - cargo
 
 rust:
-- stable
+  - stable
 
 before_script:
-- (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
-- (test -x $HOME/.cargo/bin/mdbook || cargo install --vers "^0.1" mdbook)
-- cargo install-update -a
+  - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
+  - (test -x $HOME/.cargo/bin/mdbook || cargo install --vers "^0.3" mdbook)
+  - cargo install-update -a
 
 script:
   - mdbook build