travis: don't mess with cwd in before_install

Author: darwin

.travis.yml

@@ -11,4 +11,4 @@ before_install:
   - npm i -g npm
   - yes y | sudo lein upgrade
   - curl -sSL https://raw.githubusercontent.com/cljs-oss/canary/master/scripts/install-canary.sh | bash
-  - cd test; npm install
+  - (cd test && npm install)