title: cannot find function `get_platform` in sdl2 0.31.0
body: <p>I'm using the latest version of sdl2 (0.31.0) but cannot access <a href="https://rust-sdl2.github.io/rust-sdl2/sdl2/fn.get_platform.html" rel="nofollow noreferrer"><code>get_platform</code></a>:</p>
  
  <pre><code>extern crate sdl2;
  
  pub fn main() {
      println!("{}", sdl2::get_platform());
  }
  </code></pre>
  
  <pre class="lang-none prettyprint-override"><code>$ cargo run
     Compiling repro v0.1.0 (file:///private/tmp/repro)
  error[E0425]: cannot find function `get_platform` in module `sdl2`
   --&gt; src/main.rs:4:30
    |
  4 |         println!("{}", sdl2::get_platform());
    |                              ^^^^^^^^^^^^ not found in `sdl2`
  </code></pre>
  
  <p>I tried with <code>use sdl2::*;</code> and with <code>cargo +nightly run</code>, but neither removed the error.</p>