Merge branch 'dev' for release

Merge branch 'release/v0.8.0'

Update README and add example for DataFrame.Set method

Merge branch 'dev'

Merge branch 'release/v0.5.0'

Merge branch 'release-0.4.0'

Merge branch 'dev' for release v0.3.0

Conflicts:
	CHANGELOG.md

Merge branch 'hotfix-v0.2.1'

Update CHANGELOG and README in preparation for next release

Add README to the repository