Hepdata-lib

What's Changed
* Update to GitHub container registry by clelange in https://github.com/HEPData/hepdata_lib/pull/185
* write_image: Only convert images if target is outdated. by AndreasAlbert in https://github.com/HEPData/hepdata_lib/pull/188
* Fix building docs by clelange in https://github.com/HEPData/hepdata_lib/pull/190
* Validation of output tarballs by AndreasAlbert in https://github.com/HEPData/hepdata_lib/pull/189


**Full Changelog**: https://github.com/HEPData/hepdata_lib/compare/v0.9.0...v0.10.0

What's Changed
* Handle nested TPads to get TObject by longjon929 in https://github.com/HEPData/hepdata_lib/pull/176
* Move pylint to test dependencies and split python2 and 3 version requ… by clelange in https://github.com/HEPData/hepdata_lib/pull/182
* Fix readthedocs building by clelange in https://github.com/HEPData/hepdata_lib/pull/184
* Add GitHub Action workflow to push docker image on release to ghcr.io by clelange in https://github.com/HEPData/hepdata_lib/pull/183

New Contributors
* longjon929 made their first contribution in https://github.com/HEPData/hepdata_lib/pull/176

**Full Changelog**: https://github.com/HEPData/hepdata_lib/compare/v0.8.1...v0.9.0

Add six as requirement (180)

Fix missing file in tar ball (174)

* Add test for nested file copy
* Improve handling of file copying, fix missing file problem
* Fix return type: tuple instead of generator
* Disable inappropriate pylint warning
* Freeze pylint version

- Implement one-sided uncertainty (169)
* Implement one-sided uncertainty
* Cleanup imports
- Factor out additional resources, add to Table (170)
* Factor out additional resources, add to Table
* Add test
* Add default hepdata_lib reference in Submission additional material.
* remove useless try/except block

- RootFileReader: Allow access to bin labels + small other improvements (https://github.com/HEPData/hepdata_lib/pull/168)