README: Add v0.6.0 release announcement

Author: dghubble

README.md

@@ -2,7 +2,7 @@
 
 Network boot and provision Container Linux clusters on virtual or physical hardware.
 
-**Announcement**: A new [Matchbox Terraform Provider][terraform] and [tutorial](Documentation/getting-started.md) are available.
+**Announcement**: Matchbox [v0.6.0](https://github.com/coreos/matchbox/releases) is released with a new [Matchbox Terraform Provider][terraform] and [tutorial](Documentation/getting-started.md).
 
 ## matchbox
 

scripts/devnet

@@ -90,7 +90,7 @@ function create {
     --volume config,kind=host,source=$PWD/examples/etc/matchbox,readOnly=true \
     --mount volume=data,target=/var/lib/matchbox \
     $DATA_MOUNT \
-    quay.io/coreos/matchbox:1cefbe5d9703f16c3428cd438f1639fd0e506ff9 -- -address=0.0.0.0:8080 -log-level=debug $MATCHBOX_ARGS
+    quay.io/coreos/matchbox:c8af40108fb06f345a5fdae915874b0b1b606e1a -- -address=0.0.0.0:8080 -log-level=debug $MATCHBOX_ARGS
 
   echo "Starting dnsmasq to provide DHCP/TFTP/DNS services"
   rkt rm --uuid-file=/var/run/dnsmasq-pod.uuid > /dev/null 2>&1