Update config.json with min php version
Update config.json with min php version

The module contains many instances of a function being passed to empty(), which is not allowed in php < 5.5. Only a variable may be supplied.
E.g. configure.php, line 15:
$from_default = empty(ExternalModules::getProjectSetting($prefix, $pid, 'email-sender'))?array():ExternalModules::getProjectSetting($prefix, $pid, 'email-sender').',"'.$emailTriggerModule->getProjectSetting('emailSender_var').'"';
...generates the error...
 Fatal error: Can't use function return value in write context in C:\Users\luke.stevens\Documents\UniServerZ\ssl\redcap\modules\email_alerts_v1.1\configure.php on line 15
There are many other similar occurrences in this module.
vanderbilt-redcap/email-alerts-module,vanderbilt-redcap/email-alerts-module