Prepare release 3.1

[robinmatz]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -6.61 ⚠️

Comparison is base (10c4d31) 94.32% compared to head (0810afd) 87.71%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #86      +/-   ##
==========================================
- Coverage   94.32%   87.71%   -6.61%     
==========================================
  Files           4        4              
  Lines         581      578       -3     
  Branches       90       89       -1     
==========================================
- Hits          548      507      -41     
- Misses         28       65      +37     
- Partials        5        6       +1     

Flag	Coverage Δ
acceptance	?
unit	87.71% <100.00%> (-0.41%)	⬇️

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Impacted Files	Coverage Δ
Mainframe3270/version.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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