Update seminar.md

seminar.md

@@ -57,7 +57,7 @@ and a mattermost channel for chat. To join the mattermost channel:
 
 |Date|Speaker|Title/Topic|
 |----|-------|-----------|
-|?| Dennis Müller/Michael Kohlhase | sTeX 3 – Semantic LaTeX Reimagined |
+|2022-05-30 (?) | Dennis Müller/Michael Kohlhase | sTeX 3 – Semantic LaTeX Reimagined |
 |2022-05-02| ? | ? |
 |2022-03-21| Deyan Ginev | ar5iv.org – a new preview platform for the arXMLiv dataset |
 |2022-02-07| Deyan Ginev | **rescheduled for March 21** ar5iv.org – a new preview platform for the arXMLiv dataset ([slides](https://prodg.org/talks/ar5iv_launch))|