get vfsStream via composer if its PEAR package not exists
diff --git a/.travis.yml b/.travis.yml
index 4076e2b..5eff68d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,9 +13,8 @@
   - DB=pdo/sqlite
 
 before_script:
-  - sudo pyrus channel-discover pear.bovigo.org
-  - sudo pyrus install -f bovigo/vfsStream-beta
-  - phpenv rehash
+  - curl -s http://getcomposer.org/installer | php
+  - php composer.phar install
   - sh -c "if [ '$DB' = 'pgsql' ] || [ '$DB' = 'pdo/pgsql' ]; then psql -c 'DROP DATABASE IF EXISTS ci_test;' -U postgres; fi"
   - sh -c "if [ '$DB' = 'pgsql' ] || [ '$DB' = 'pdo/pgsql' ]; then psql -c 'create database ci_test;' -U postgres; fi"
   - sh -c "if [ '$DB' = 'mysql' ] || [ '$DB' = 'pdo/mysql' ]; then mysql -e 'create database IF NOT EXISTS ci_test;'; fi"