Merge pull request #138 from Changaco/digests

remove a remnant of Python 2

Merge pull request #127 from Changaco/fix-attribute-error

add support for different file metadata encodings (#125)

Merge pull request #118 from Changaco/v4

Merge pull request #116 from trofi/master

Merge pull request #114 from Changaco/various

Merge pull request #110 from Changaco/clean-up

add `long_description_content_type` in `setup.py`

Merge pull request #72 from srandall52/master

Set options for writing archive. Set uid/gid lookup for reading disk.