Added support for Python 3.12; Fixed py34+ in docs

[andy-maier]

No description provided.

[coveralls]

coverage: 92.609% (+0.01%) from 92.595%
when pulling 81015a5 on andy/py312
into 675cb32 on master.

[KSchopmeyer]

dev-requirements

importlib-metadata==2.1.3,<5.0.0; python_version <= '3.6'
importlib-metadata==4.8.3; python_version >= '3.7'

Shouldn't this be >= rather than ==

[KSchopmeyer]

This is a question:

importlib-metadata package in minimum-constraints and dev-requirements

The versions for this package have been moved from:

importlib-metadata==0.23; python_version <= '3.7'
importlib-metadata==4.8.3; python_version >= '3.8'

to

importlib-metadata==2.1.3; python_version <= '3.6'
importlib-metadata==4.8.3; python_version >= '3.7'

i.e the version changed from 0.23 to 2.1.3 and also the python-versions changed from 3.7 -> 3.6 and from 3.8 -> 3.7

Not sure why.

[KSchopmeyer]

flake8 package version change from 4.0.1 to 5.0.0 for python 10, Again question of why.

flake8>=5.0.0; python_version >= '3.10'

[KSchopmeyer]

pycodestyle dev-requirements

pycodestyle>=2.9.0; python_version >= '3.10'

before it was 2.8.0 for python 3.10.

Was this a simplification to have same version for 3.10 - 3.12 or was there a reason to change version from 2.8.0 to 2.9.0 for python 3.10 and python 3.11.

[andy-maier]

dev-requirements importlib-metadata: Indeed, this was a mistake and should be >=

[andy-maier]

On importlib-metadata versions: I think I took that from zhmcclient. When looking at the versions though, 2.1.3 is the last version supporting py35 and 4.8.3 is the last version supporting 3.6. So I think I got the python versions wrong and it should have been:

importlib-metadata==2.1.3; python_version <= '3.5'
importlib-metadata==4.8.3; python_version >= '3.6'

I don't recall why I increased the versions in the first place, but it probably was the desire to use the latest possible versions. Tox and nbconvert have increased their minimum versions of importlib-metadata way beyond the long used version 0.12, so it is definitely time to go up there.

[andy-maier]

On flake8 change from 4.0.1 to 5.0.0 for python 3.10: Not sure - probably another copy from zhmcclient. The entire flake8 section looks the same.

Probably the same for the pycodestyle changes.

[andy-maier]

I changed the python version boundary for importlib-metadata to match what the required versions support:

importlib-metadata==2.1.3; python_version <= '3.5'
importlib-metadata==4.8.3; python_version >= '3.6'

[KSchopmeyer]

Approved