small tweaks to travis config

we can use stable now that rust 2018 shipped

Author: steveklabnik

.travis.yml

@@ -1,7 +1,7 @@
 language: rust
 cache: cargo
-rust: nightly
+rust: stable
 script:
   - cargo run
 after_success:
-- test $TRAVIS_PULL_REQUEST == "false" && test $TRAVIS_BRANCH == "master" && bash deploy.sh
+  - test $TRAVIS_PULL_REQUEST == "false" && test $TRAVIS_BRANCH == "master" && bash deploy.sh