[Inpycon] Update "On Twitter" link.

[Bhargav]

Hello!

"On Twitter" link on http://in.pycon.org/2012/ does not redirect to
http://twitter.com/pyconindia.

I think the following line has to be modified;
https://github.com/ipss/pyconindia2012/blob/master/themes/pyconindia2012/templates/inc/blog.html#L21

Thank you,
Bhargav.
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