----------------
- existing subscribers get updated when importing with ``-u`` flag
- login() api method has been disabled (see `shutdown info`_)
so we change the help text on how to obtain an api key
.. _`shutdown info`: http://us1.campaign-archive1.com/?u=f7b9ee22124ff6454424dc10c&id=2b2a3d9f1f
- rename README.txt to .rst for nice display on github