Unitxt 1.6.1

What's Changed

• openmoji link fixed by @Roni-Friedman in #532
• Add side effect operators that does not modify the stream like download and extract by @elronbandel in #523
• Update version to 1.6.1 by @elronbandel in #533

Breaking Changes:

• StreamSource is depracted and replaced with SourceOperator in #523

Full Changelog: 1.6.0...1.6.1