collections.Mapping has been removed

[tjrob]

collections.Mapping has been deprecated for almost a decade.

In _unix.py:
10: import collections.abc
44: collections.mapping => collections.abc.Mapping

[lneuhaus]

+1. The issue seems to be fixed now on the latest commit in the main branch, but the tag 0.6.1 (latest release), AND the version available on PyPI (0.6.1) refer to a commit that is slightly older, and does not contain this fix. The proper action is IMHO to release release the latest version as 0.6.2. That would be much appreciated. Thanks!