remove encoding option from json field...

[abom]

Description

Prepare for python 3.9 support, as it's already not used anywhere.

Changes

• Remove json parameter from fields.Json

Related Issues

#576

Checklist

• Pre-commit hook is installed to do formatting checks before committing code...etc
• Tests included
• Build pass
• Documentation
• Code format and docstrings

[codecov-commenter]

Codecov Report

Merging #584 (179de97) into development (9c51f70) will decrease coverage by 0.45%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #584      +/-   ##
===============================================
- Coverage        70.96%   70.50%   -0.46%     
===============================================
  Files               91       91              
  Lines             4694     4693       -1     
===============================================
- Hits              3331     3309      -22     
- Misses            1363     1384      +21     

Impacted Files	Coverage Δ
jumpscale/core/base/fields.py	94.89% <100.00%> (-0.02%)	⬇️
jumpscale/servers/gedis/server.py	65.26% <0.00%> (-7.37%)	⬇️
jumpscale/sals/process/__init__.py	63.63% <0.00%> (-1.38%)	⬇️
jumpscale/tools/startupcmd/startupcmd.py	85.53% <0.00%> (-1.26%)	⬇️
jumpscale/core/logging/logging.py	94.35% <0.00%> (-0.57%)	⬇️
jumpscale/clients/redis/redis.py	88.57% <0.00%> (+2.85%)	⬆️

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