Remove extraneous "libc" dependency from the README example
@@ -32,13 +32,11 @@ Glutin is an OpenGL context creation library and doesn't directly provide OpenGL
```toml
[dependencies]
gl = "*"
-libc = "*"
```
```rust
extern crate gl;
extern crate glutin;
-extern crate libc;
use glutin::GlContext;
