Update .travis.yml

Author: 66Ton99

.travis.yml

@@ -3,7 +3,9 @@ language: php
 php: [5.5,5.6,7.0]
 
 env:
-  - SF_VERSION='~3.0.0'
+  - SF_VERSION='~3.1.0'
+  - SF_VERSION='~3.2.0'
+  - SF_VERSION='~3.3.0'
 
 before_script:
   - if [ "$COVERAGE" != "true" ] && [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then phpenv config-rm xdebug.ini; fi