Test for older python versions.

[BenediktBurger]

Just to test old python versions (Py 3.7, Py 3.8)

[codecov]

Codecov Report

Attention: Patch coverage is 91.76030% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 87.53%. Comparing base (4cc7cca) to head (08c198c).

Files	Patch %	Lines
pyleco/json_utils/rpc_server_definition.py	84.81%	7 Missing and 5 partials ⚠️
pyleco/json_utils/errors.py	88.88%	4 Missing ⚠️
pyleco/actors/actor.py	62.50%	2 Missing and 1 partial ⚠️
pyleco/directors/transparent_director.py	57.14%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           feature/legacy      #61      +/-   ##
==================================================
+ Coverage           87.28%   87.53%   +0.25%     
==================================================
  Files                  33       36       +3     
  Lines                2626     2856     +230     
  Branches              314      345      +31     
==================================================
+ Hits                 2292     2500     +208     
- Misses                280      295      +15     
- Partials               54       61       +7     

Flag	Coverage Δ
unittests	87.53% <91.76%> (+0.25%)	⬆️

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[BenediktBurger]

Python<3.9 requires typing.List instead of list.
On the other hand, pydantic (a dependency of openrpc) requires list and not typing.List to annotate methods available via RPC.

[BenediktBurger]

We have to rename cls argument to device class.
(major change).

For 3.7, setup tools makes problems

[BenediktBurger]

typing.Protocol is for Python>=3.8, so 3.7 is not viable
Other 3.8 feature: walrus operator (":=")