Update README.rst

Author: charleseidsness

README.rst

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 aiohttp_jinja2
 ==============
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+**This is a fork of `aio-libs/aiohttp-jinja2#154<https://github.com/aio-libs/aiohttp-jinja2/pull/154>`_ which adds support for calling asyncio coroutines from jinja scripts.**
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+This feature is disabled by default, to enable it you must set enable_async=True when calling the setup function. This will set enable_async in the jinja2 Environment.
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 .. image:: https://travis-ci.org/aio-libs/aiohttp-jinja2.svg?branch=master
     :target: https://travis-ci.org/aio-libs/aiohttp-jinja2
 .. image:: https://codecov.io/gh/aio-libs/aiohttp-jinja2/branch/master/graph/badge.svg