README.md: add status badge for raspberrypi4
@@ -5,6 +5,7 @@ Yocto BSP layer for the Raspberry Pi boards - <http://www.raspberrypi.org/>.
[![Build Status](https://yocto-ci.resin.io/job/meta-raspberrypi1/badge/icon)](https://yocto-ci.resin.io/job/meta-raspberrypi1)
[![Build Status](https://yocto-ci.resin.io/job/meta-raspberrypi2/badge/icon)](https://yocto-ci.resin.io/job/meta-raspberrypi2)
[![Build Status](https://yocto-ci.resin.io/job/meta-raspberrypi3/badge/icon)](https://yocto-ci.resin.io/job/meta-raspberrypi3)
+[![Build Status](https://yocto-ci.resin.io/job/meta-raspberrypi4/badge/icon)](https://yocto-ci.resin.io/job/meta-raspberrypi4)
[![Documentation Status](https://readthedocs.org/projects/meta-raspberrypi/badge/?version=latest)](https://meta-raspberrypi.readthedocs.io/en/latest/?badge=latest)
[![Matrix](https://img.shields.io/matrix/meta-raspberrypi:cub.icu.svg?server_fqdn=matrix.cub.icu)](https://matrix.to/#/#meta-raspberrypi:cub.icu)
