Update README

[abaumann]

Updated the Dversion flag to not include [square brackets], which does not work correctly.

The [Optional] step for Sirocco is not optional as the dependency is in the pom.xml. If we want this as an optional step, maybe add two different examples?

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[abaumann]

I signed it!

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[googlebot]

CLAs look good, thanks!

[datancoffee]

Fixing docs with correct instructions

[abaumann]

👍 👍