Release notes for 1.3
Release notes for 1.3

Add release notes for the 1.3 release, including the added functionality, bugs that were fixed,
and any new limitations that were introduced.

sjberman/k8s-bigip-ctlr,F5Networks/k8s-bigip-ctlr,michaeldayreads/k8s-bigip-ctlr,F5Networks/k8s-bigip-ctlr,sjberman/k8s-bigip-ctlr,michaeldayreads/k8s-bigip-ctlr,sjberman/k8s-bigip-ctlr,sjberman/k8s-bigip-ctlr,F5Networks/k8s-bigip-ctlr,michaeldayreads/k8s-bigip-ctlr,F5Networks/k8s-bigip-ctlr,michaeldayreads/k8s-bigip-ctlr,michaeldayreads/k8s-bigip-ctlr,sjberman/k8s-bigip-ctlr