2.2.0: Update README with Kubernetes Playground features (#280)

[skip ci]

2.1.0

Move all CI setup steps to install-libvirt (#200)

2.0.1

This release bring some minor fixes and performance improvements.

2.0.0

This release marks major improvements to the provisioning process, such as:

• Splitting the process in two steps (base box + rest of the cluster).
• Support multiple Kubernetes networking plugin (currently: WeaveNet, flannel, and Calico)
• Support very fast re-provisioning of networking plugin to switch from one to another after initial deployment

1.0.0

Add container grafana dashboard