Update read to include pyenv-init - note.

The use of may refers to the fact that 'may' may already be in their profile\in which case, they do not need to add it. If you have grammar suggestions, please advise.

> On 2014/12/11, at 19:07, Yamashita, Yuu <notifications@github.com> wrote:
> 
> In README.md:
> 
> >          $ echo 'eval "$(pyenv virtualenv-init -)"' >> ~/.bash_profile
> > -
> > +    **Pyenv note**: You may also need to add 'eval "$(pyenv init -)"' to your profile if you haven't done so already.
> The pyenv configuration of eval "$(pyenv init -)" should always be in shell profile. It isn't may.
> 
> \
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