Fix documentation link for MicroK8S in readme

[struffel]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
It simply fixes a link in the Readme document.

Which issue(s) this PR fixes:

Fixes #612

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[linux-foundation-easycla]

• ✅login: struffel / (c54ade0)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @struffel. Thanks for your PR.

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[andyzhangx]

/lgtm
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, struffel

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[coveralls]

Pull Request Test Coverage Report for Build 7914780495

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.915%

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Totals
Change from base Build 7910543056:	0.0%
Covered Lines:	887
Relevant Lines:	1124

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💛 - Coveralls