Add temporary fix for running security checker with Travis
Add temporary fix for running security checker with Travis

The SensioLabs security checker has switched to Lets Encrypt, which has broken some things

Most issues have been fixed, but Travis still needs to offer ssl capabilities to PHP

See: https://github.com/sensiolabs/security-checker/issues/73, https://github.com/travis-ci/travis-ci/issues/6339, https://github.com/sensiolabs/security-checker/pull/77#issuecomment-290733113

thijskh/OpenConext-engineblock,thijskh/OpenConext-engineblock,thijskh/OpenConext-engineblock,thijskh/OpenConext-engineblock