Update pinned k3s version to v1.17.2+k3s1

Changelog for 0.8.0:

• PR #168 Upgrade to k3s v1.17.2+k3s1 by @elmariofredo
• PR #166 Bump Linkerd version to latest stable by @grampelberg

Kubernetes 1.17 is now available as the pinned version for k3sup install 🎉

Get it now!

k3sup update

# or

curl -sSLf https://get.k3sup.dev | sudo sh

Generated by Derek