spec.html: Update metadata

Author: js-choi

spec.html

@@ -2,9 +2,9 @@
 title: ES pipe operator (2021)
 status: proposal
 stage: 2
-location: https://github.com/js-choi/proposal-hack-pipes
+location: https://github.com/tc39/proposal-pipeline-operator
 copyright: false
-contributors: J. S. Choi
+contributors: J. S. Choi, James DiGioia, Ron Buckton, Tab Atkins-Bittner
 </pre>
 <script src=ecmarkup.js defer></script>
 <link rel=stylesheet href=ecmarkup.css>
@@ -978,4 +978,4 @@ <h1>CreateDynamicFunction ( _constructor_, _newTarget_, _kind_, _args_ )</h1>
       </emu-clause>
     </emu-clause>
   </emu-clause>
-</emu-clause>
+</emu-clause>