Update acknowledgements.md

acknowledgements.md

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-  <p><strong>Date:</strong> Published 29 November 2018.</p>
-  <p><strong>Editors:</strong> <a href="https://www.w3.org/People/shadi">Shadi Abou-Zahra</a>, Eric Velleman, Sanne Eendebak, Roel Antonisse, and Leon Baauw.</p>
+  <p><strong>Date:</strong> Updated 11 March 2021. First published November 2018. <a href="../changelog/">Changelog</a>.</p>
+  <p><strong>Editors:</strong> <a href="https://www.w3.org/People/shadi">Shadi Abou-Zahra</a>, Eric Velleman, Sanne Eendebak, Roel Antonisse, and Bas de Bruin.</p>
   <p>Developed by the <a href="https://www.w3.org/WAI/EO/">Education and Outreach Working Group (EOWG)</a>. Developed as part of the <a href="https://www.w3.org/WAI/Tools/">WAI-Tools project</a>, co-funded by the European Commission.</p>
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@@ -21,6 +21,7 @@ Project Leadership
     -   Eric Velleman, Accessibility Foundation
     -   Sanne Eendebak, Accessibility Foundation
     -   Roel Antonisse, Accessibility Foundation
+    -   Bas de Bruin, Accessibility Foundation
     -   Leon Baauw, Accessibility Foundation
 -   **EOWG Co-Chairs:**
     -   Sharron Rush, Knowbility