Added Python 3.4 to list of supported version in docs/intro/install.txt

--------------

Being a Python Web framework, Django requires Python. It works with Python 2.7,

3.2 or 3.3. All these versions of Python include a lightweight database called

SQLite_ so you won't need to set up a database just yet.

3.2, 3.3, or 3.4. All these versions of Python include a lightweight database

called SQLite_ so you won't need to set up a database just yet.

.. _sqlite: http://sqlite.org/