changes sms and email reminder messages

Adds new messages in to config.json for sms and email (they're the same text right now).

If you wan to test locally you need to declare <code>contact</code> in <code>createReminders()</code>. This could be either an email address string (e.g. <code>'kavih@example.com</code>) or a phone number string(e.g.<code>'4155555555'</code>).