Version 0.3.0 Released

[Brad Warren]

We've just pushed version 0.3.0 of the Let's Encrypt client to PyPI.
Changes in this release include:

* A non-interactive mode which can be enabled by including `-n` or
`--non-interactive` on the command line. This can be used to
guarantee the client will not prompt when run automatically using
cron/systemd.
* Preparation for the new letsencrypt-auto script. Over the past
couple months, we've been working on increasing the reliability and
security of letsencrypt-auto. A number of changes landed in this
release to prepare for the new version of this script.

For a more complete list of changes, see:

https://github.com/letsencrypt/letsencrypt/issues?q=is%3Aissue+milestone%3A0.3.0