Added Python version and dependency information to README

[Damgaard]

The authors of #111 and a recent r/learnpython thread both had problems installing PRAW. This was because the user tried using PRAW with python 2.5 when it requires at least 2.6. Adding this information to the README should make it easier for people with a similar problem in the future to trouble shoot.

[bboe]

PRAW does in fact have dependencies, well one. It's listed here: https://github.com/praw-dev/praw/blob/master/setup.py#L42

However, I prefer to not mention it as pip automatically installs it when PRAW is installed, thus the end-user need not concern themselves with it.

[Damgaard]

So you would like the README not to contain any mentioning of dependencies at all?

[bboe]

Well I would say something along the lines of "installation via pip or easy_install will automatically install all of PRAW's dependencies."

[Damgaard]

Ìnstallation via setup.pyis suggested as an option in README, so writing that would leave people using setup.pywondering what the dependencies are.

[bboe]

You are correct. In that case, maybe indicate in that section that the user is responsible for installing all the dependencies and link to the setup.py file location.

[Damgaard]

I would prefer to say that PRAW has a dependency on six, but installing via pip or easyinstall will automatically install the module. That way all the information is in the clear for those who need it, and the rest can read that it will not be something they need to think about.

[bboe]

I'm cool with that as long as it's clear the typical installation path doesn't require dependencies to be installed manually.

[Damgaard]

I've updated the pull request with what we've discussed. Does it look better?

[bboe]

Yes, that looks good. Thanks.