Latest SMW version used on Travis?

[JeroenDeDauw]

    "require": {
        "php": ">=5.5.0",
        "composer/installers": "1.*,>=1.0.1",
        "mediawiki/semantic-media-wiki": "~2.4"
    },
    "require-dev": {
        "mediawiki/semantic-media-wiki": "@dev",
        "squizlabs/php_codesniffer": "~2.1",
        "phpmd/phpmd": "~2.1"
    },

By the looks of it, this will cause SMW ~2.4@dev to be installed on TravisCI. So after the release of SMW 2.4, incorrect dependence on newer features part of 2.x will not be caught.