README changes to remove generator macro example

Changed README example using the generate_gl_bindings! macro to use the build dependency and build.rs script.
Weird.  Compiler yells at me if I don't have those in the crate.  Am I
missing something that allows those features at a top level somewhere?

Nathan Sizemore
@nathansizemore | 937.823.7229

On Tue, Dec 30, 2014 at 1:24 PM, tomaka <notifications@github.com> wrote:

> In README.md
> <https://github.com/bjz/gl-rs/pull/258#discussion-diff-22358022>:
>
> >  Then use it like this:
> >
> >  ~~~rust
> > +#![feature(phase)]
>
> And #![feature(phase)] is not needed either.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/bjz/gl-rs/pull/258/files#r22358022>.
>