Mark AttrWrap as PendingDeprecation

[penguinolog]

• AttrWrap was marked as deprecated in documentation, but not handled in tests/runtime

• Migrate examples from AttrWrap to AttrMap and apply auto-format

Checklist

• I've ensured that similar functionality has not already been implemented
• I've ensured that similar functionality has not earlier been proposed and declined
• I've branched off the master or python-dual-support branch
• I've merged fresh upstream into my branch recently
• I've ran tox successfully in local environment
• I've included docstrings and/or documentation and/or examples for my code (if this is a new feature)

[coveralls]

coverage: 73.566% (+0.001%) from 73.565% when pulling 7af77c1 on penguinolog:deprecated_attr_wrap into e588f7a on urwid:master.