fix to_marshallable_type

[mas15]

Having __getitem__ does not mean you can do dict unpacking (**obj)
Related to old bug:
flask-restful/flask-restful#324

[codecov]

Codecov Report

Merging #241 (9fbe250) into master (a59b634) will decrease coverage by 0.58%.
The diff coverage is 60.00%.

@@ Coverage Diff @@ ## master #241 +/- ## ========================================== - Coverage 96.85% 96.27% -0.59%  ========================================== Files 19 19 Lines 2705 2708 +3 ========================================== - Hits 2620 2607 -13  - Misses 85 101 +16 

Impacted Files	Coverage Δ
flask_restx/fields.py	95.94% <60.00%> (-0.65%)	⬇️
flask_restx/schemas/__init__.py	80.32% <0.00%> (-3.28%)	⬇️
flask_restx/cors.py	78.04% <0.00%> (-2.44%)	⬇️
flask_restx/model.py	95.55% <0.00%> (-1.49%)	⬇️
flask_restx/swagger.py	95.48% <0.00%> (-1.26%)	⬇️
flask_restx/marshalling.py	97.32% <0.00%> (-0.90%)	⬇️
flask_restx/reqparse.py	97.87% <0.00%> (-0.86%)	⬇️
flask_restx/inputs.py	98.91% <0.00%> (-0.01%)	⬇️

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[mas15]

@j5awry Hi, is this project dead?

[j5awry]

Dead, no. But the current group of maintainers are stretched thin. If you'd like to become a maintainer, and help with release work and other administrative duties, please head to our gitter and volunteer: https://gitter.im/python-restx/community

We're late on a release, but our main release guide hasn't had a chance to sort through everything.