django 3-4 support

[dgk]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@ddba74b). Click here to learn what that means.
Report is 16 commits behind head on develop.
The diff coverage is 98.00%.

@@            Coverage Diff             @@
##             develop      #54   +/-   ##
==========================================
  Coverage           ?   95.30%           
==========================================
  Files              ?       35           
  Lines              ?     1598           
  Branches           ?        0           
==========================================
  Hits               ?     1523           
  Misses             ?       75           
  Partials           ?        0           

Files Changed	Coverage Δ
business_logic/blockly/build.py	97.18% <ø> (ø)
business_logic/models/reference.py	96.15% <50.00%> (ø)
business_logic/__init__.py	100.00% <100.00%> (ø)
business_logic/admin.py	100.00% <100.00%> (ø)
business_logic/apps.py	100.00% <100.00%> (ø)
business_logic/blockly/create.py	95.77% <100.00%> (ø)
business_logic/blockly/parse.py	94.70% <100.00%> (ø)
business_logic/models/assignment.py	100.00% <100.00%> (ø)
business_logic/models/constant.py	100.00% <100.00%> (ø)
business_logic/models/foreach.py	100.00% <100.00%> (ø)
... and 17 more

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