Add workaround for https://bugs.php.net/bug.php?id=70757 (#1490582)

Aleksander Machniak

2015-11-06 48ab1add3548beecedb60e6355e4c4dbfb1d6bc1

 composer.json-dist

@@ -10,7 +10,7 @@
    ],
    "require": {
        "php": ">=5.3.0",
        "roundcube/plugin-installer": ">=0.1.2"
        "roundcube/plugin-installer": ">=0.1.3"
    },
    "minimum-stability": "dev"
}