add pull policy to docker run in order to use the very last container (…

…arriven#160)

README.md

@@ -57,7 +57,7 @@ Unpack the archive and run it.
 If you already have installed Docker, just run:
 
 ```bash
-docker run ghcr.io/arriven/db1000n
+docker run --pull always ghcr.io/arriven/db1000n
 ```
 
 ### Advanced users