py-netaddr: updated to 1.2.1

Release: 1.2.1

Fixed:

* Fix bad version 1.2.0 upload to PyPI – now yanked. No changes to the package.

Release: 1.2.0

Added:

* Add CLI tool subcommand to display :ref:`cli-network-info`.

Changed:

* Support running :ref:`interactive-shell` without IPython installed.

Fixed:

* Explicitly raise ``TypeError`` is a non-string value is passed to :func:`valid_ipv4`
  or :func:`valid_ipv6`.

(adam)