containerlab version constraint to README.md

Author: iljarotar

README.md

@@ -24,7 +24,7 @@ The mini-lab is a small, virtual setup to locally run the metal-stack. It deploy
 - [docker](https://www.docker.com/) >= 18.09 (for using kind and our deployment base image)
 - [docker-compose](https://docs.docker.com/compose/) >= 1.25.4 (for ease of use and for parallelizing control plane and partition deployment)
 - [kind](https://github.com/kubernetes-sigs/kind/releases) == v0.9.0 (for hosting the metal control plane on a kubernetes cluster v1.19.1)
-- [containerlab](https://containerlab.srlinux.dev/install/)
+- [containerlab](https://containerlab.srlinux.dev/install/) == v0.19.2
 - the lab creates a docker network on your host machine (`172.17.0.1`), this hopefully does not overlap with other networks you have
 - (recommended) haveged to have enough random entropy (only needed if the PXE process does not work)