Update to Stage 3

During [T39 2017 July meeting](https://github.com/tc39/agendas/blob/master/2017/07.md) the spec was approved to be Stage 3.
tc39 · Jul 27, 2017 · 5a4ff5f · 5a4ff5f
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 <pre class=metadata>
 title: Integrated public and private fields proposal
-stage: 2
+stage: 3
 contributors: Daniel Ehrenberg, Jeff Morrison, Kevin Smith, Kevin Gibbons
 </pre>
 <style>