fix example yaml file error in README.md

[akfmdl]

What this PR does / why we need it:

Which issue(s) this PR fixes: The original example yaml file causes errors because of wrong Indentation and hyphen

Fixes #

Special notes for your reviewer:

[seldondev]

Hi @akfmdl. Thanks for your PR.

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[akfmdl]

/assign @agrski

[axsaucedo]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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[axsaucedo]

Nice one thanks @akfmdl