update README.md

Author: simon mittelberger

README.md

@@ -8,17 +8,17 @@ This runs vsftpd with multiple user accounts inside an alpine docker container.
 
 ```sh
 docker run \
-	--detach \
+    --detach \
     --env PASV_ADDRESS=192.168.0.1 \
     --env PASV_MIN_PORT=50000 \
     --env PASV_MAX_PORT=50100 \
     --env GROUPS=group1:1001;group2:1002 \
     --env USERS=user1:pass1:1001:group1;user2:pass2:1002:group2 \
-	--name vsftpd \
-	--publish 20-21:20-21/tcp \
-	--publish 50000-50100:50000-50100/tcp \
-	--volume /data:/home \
-	nomisim/vsftpd
+    --name vsftpd \
+    --publish 20-21:20-21/tcp \
+    --publish 50000-50100:50000-50100/tcp \
+    --volume /data:/home \
+    nomisim/vsftpd
 ```
 
 ### ... via `docker compose`