Ensure container gets cleaned up on stop

Author: c-w

README.md

@@ -130,7 +130,7 @@ Depending on your installation method, there are two options:
 First, run a Docker container:
 
 ```bash
-docker run -d --name doccano \
+docker run -d --rm --name doccano \
   -e "ADMIN_USERNAME=admin" \
   -e "[email protected]" \
   -e "ADMIN_PASSWORD=password" \