add rsync to depends in README.md

Description

PR: https://github.com/truenas/scale-build/pull/267

I tried to do `make packages` and it crashed because `rsync` wasn't installed even though I simply copy and pasted the `apt install` command from the `README.md` 😄

Add it to the `README.md` for lazy people like myself can copy and paste.

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Bug Clerk April 2, 2022 at 7:31 PM

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Katalon Platform

Created April 1, 2022 at 7:17 PM
Updated July 6, 2022 at 8:59 PM
Resolved April 5, 2022 at 3:07 PM