title: Is there a command to update Cargo to the latest official release?
body: <p>I seem to have diverging versions of <code>rustc</code> and <code>cargo</code> (I think), </p>
  
  <pre class="lang-none prettyprint-override"><code>$ rustc -V
  rustc 1.9.0 (e4e8b6668 2016-05-18)
  $ cargo -V
  cargo 0.10.0-nightly (10ddd7d 2016-04-08)
  </code></pre>
  
  <p>Is there a command akin to </p>
  
  <pre class="lang-none prettyprint-override"><code>pip install --upgrade pip 
  </code></pre>
  
  <p>for upgrading <code>cargo</code>? I.e. something like</p>
  
  <pre class="lang-none prettyprint-override"><code>cargo install --upgrade cargo
  </code></pre>