README: Remove commented line in cosa shell function
This breaks on the default Zsh configuration. See:
@@ -102,7 +102,7 @@ here need to change for that.
```
cosa() {
env | grep COREOS_ASSEMBLER
- set -x # so we can see what command gets run
+ set -x
podman run --rm -ti --security-opt label=disable --privileged \
--uidmap=1000:0:1 --uidmap=0:1:1000 --uidmap 1001:1001:64536 \
-v ${PWD}:/srv/ --device /dev/kvm --device /dev/fuse \
