Correct path to install script.

Author: octalmage

.travis.yml

@@ -16,6 +16,6 @@ matrix:
       env: WP_VERSION=latest WP_MULTISITE=1
 
 before_script:
-  - bash bin/install-wp-tests.sh wordpress_test root '' localhost $WP_VERSION
+  - bash tests/bin/install-wp-tests.sh wordpress_test root '' localhost $WP_VERSION
 
 script: phpunit