Build failing in Travis CI due to metrics-server changes

[geerlingguy]

I shouldn't rely on master since it changes too frequently. Going to lock into version v0.3.6 instead. Build is failing currently due to different folder structure:

TASK [Download the metrics-server project from GitHub.] ************************
changed: [kube1 -> 127.0.0.1]

TASK [Overwrite metrics-server deployment manifest.] ***************************
fatal: [kube1 -> 127.0.0.1]: FAILED! => {"changed": false, "checksum": "326c02006c85faf2d5b01c1d7bbc539d7c76561e", "msg": "Destination directory /root/metrics-server/deploy/kubernetes does not exist"}

See failed build: https://travis-ci.org/github/geerlingguy/raspberry-pi-dramble/builds/685030066