Umbr-api

Added

- an option `--exclude` to filter out columns from output
- an option `--format` to format output
- Code of Conduct file
- Contributing file
- templates for PR and bug reporting

Changed

- small edits of README

Fixed

- error 400 for Management API `roles` call if paging is out of index

Added

- changelog file (CHANGELOG.md)
- black formatter as a default option
- optional linters (bandit, isort, safety, pyroma, check-manifest)
- configuration files for pylint (.pylintrc) and markdownlint (.markdownlint.json)
- README description of a keyring module issue with unsigned python binaries
- a logo file
- guidelines badges

Changed

- license headers and a copyright year to 2019
- README badges
- ci for new python builds
- sort imports
- replace pylint exceptions codes with symbolic names

Removed

- support for Python 3.4

Fixed

- pytest import from a local directory
- typos and other minor edits