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another typo

I swear the Dockerfile itself is correct I am just typoing the README

Changed files
+1 -1
+1 -1
readme.md
···
but you can change it with the `UID` and `GID` build arguments.
```sh
-
docker build -t knot:latest --build-arg UID=$(id -u) GID=$(id -u)
+
docker build -t knot:latest --build-arg UID=$(id -u) GID=$(id -g)
```
The command above for example will create a user with the host user's UID and GID.