Add more metadata to spec text

index.html

@@ -3,7 +3,7 @@
 <link rel="stylesheet" href="./spec.css">
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spec.emu

@@ -5,8 +5,10 @@
 <script src="./spec.js"></script>
 <pre class="metadata">
 title: Array Filtering
+status: proposal
 stage: 1
 contributors: Justin Ridgewell
+location: https://tc39.es/proposal-array-filtering/
 </pre>
 
 <emu-clause id="sec-scope">