Update DOI to one seen on zenodo

Update DOI

Update minor version to 1.2.2 following cherry-pick fix

Update version to 1.2.1 for minor release

Update version to 1.2.0

Provide mock 'dicom' import with helpful transition information (pydi…

…com#585)

* Provide mock 'dicom' import with helpful transition information

* pep-8 fix

Update version to 1.0.1 due to previous 1.0.0 on PyPi