Update seminar.md

seminar.md

@@ -63,10 +63,7 @@ and a mattermost channel for chat. To join the mattermost channel:
 
 |Date|Speaker|Title/Topic|
 |----|-------|-----------|
-|2021-08-30| - | *summer break* |
-|2021-08-02| - | *summer break* |
-|2021-07-05| - | *summer break* |
-|2021-06-07| - | *summer break* |
+|2021-06-07| - | *beginning of an overly long summer break* |
 |2021-05-10| Anton Lorenzen | A type system for natural language ([slides](https://nc.kwarc.info/s/piPmS9rzJar2bkB)) |
 |2021-04-12| Deyan Ginev | Scientific Statement Classification over arXiv.org ([slides](https://prodg.org/talks/scientific_statement_classification#1), [recording](https://www.fau.tv/clip/id/30853)) |
 |2021-03-29| André Greiner-Petter | Comparative Verification of Digital Mathematical Libraries and Computer Algebra Systems ([slides](https://gist.github.com/AndreG-P/4fdbd42f313d112c888c10c2136a3620)) |