Add missing ";" to the travis config

Summary:
Travis build currenlty fails because it
merges all script lines into one line. To seperate
the commands an ";" has to be added after each command.
https://travis-ci.org/dkd/php-cmis-client/jobs/40975414

Reviewers: dkd-doan, #forgetit-dev

Reviewed By: dkd-doan, #forgetit-dev

Differential Revision: https://phabricator.dkd.de/D401