- update to 5.9.5:
* in case of exception, display a cleaner error
traceback by hiding the `KeyError` bit deriving from a
missed cache hit.
* print the full traceback when a `DeprecationWarning`
or `UserWarning` is raised.
* there are cases where `Process.cwd()`_ cannot be
determined (e.g. directory no longer exists), in which case
we returned either ``None`` or an empty string.
This was consolidated and we now return ``""`` on all
platforms.
* [UNIX]: if process is a zombie, and we can only
determine part of the its truncated `Process.name()`_
(15 chars), don't fail with `ZombieProcess`_ when we try
to guess the full name from the `Process.cmdline()`_. Just
return the truncated name.
* on certain kernels, ``"MemAvailable"`` field
from ``/proc/meminfo`` returns ``0`` (possibly a kernel bug), in
which case we calculate an approximation for ``available``
memory which matches "free" CLI utility.
* `disk_partitions()`_: do not unnecessarily
read /proc/filesystems and raise `AccessDenied`_ unless user
specified `all=False` argument.
* `users()`_ loses precision for ``started``
attribute (off by 1 minute).
* if cwd no longer exists. Return an empty string instead.