Include svg artifacts instead of pngs in Readme

Change-Id: Ic927fa1e0dfaaac997fdf62e895a050f763a4b4b
diff --git a/Readme.md b/Readme.md
index a4c02df..fac6077 100644
--- a/Readme.md
+++ b/Readme.md
@@ -14,11 +14,11 @@
 
 ### Tokens per ICC genre
 
-![tokens per ICC genre](https://gitlab.ids-mannheim.de/ICC/2023-07-20-ICC-ICLC10/-/jobs/artifacts/master/raw/target/tokens_per_genre.png?job=build-job)
+![tokens per ICC genre](https://gitlab.ids-mannheim.de/ICC/2023-07-20-ICC-ICLC10/-/jobs/artifacts/master/raw/target/tokens_per_genre.svg?job=build-job)
 
 ### Tokens per year
 
-![tokens per year](https://gitlab.ids-mannheim.de/ICC/2023-07-20-ICC-ICLC10/-/jobs/artifacts/master/raw/target/tokens_per_year.png?job=build-job)
+![tokens per year](https://gitlab.ids-mannheim.de/ICC/2023-07-20-ICC-ICLC10/-/jobs/artifacts/master/raw/target/tokens_per_year.svg?job=build-job)
 
 ### POS proportions