🤖 Update version of docker image in README to v2.13.1

README.md

@@ -57,7 +57,7 @@ If you want to use it internally with docker-compose, this should give you a goo
 ```yml
 services:
   pdf:
-    image: ghcr.io/rmehner/bits-to-dead-trees:v2.13.0
+    image: ghcr.io/rmehner/bits-to-dead-trees:v2.13.1
     ports:
       - 8000:8000
 ```