allow definition of own swagger schema for path variables.

[InuSasha]

Using custom converters to store the '__restx_schema__' dict. The dict updates the parameter for swagger.

Tested with (and without):

class DatabaseConverter(BaseConverter):
    __restx_schema__ = {'type': 'string', 'enum': ['ProdDB','TestDB1','TestDB2']}

The result, was a dropdown menu instead of an input field.

[codecov[bot]]

Codecov Report

Merging #279 (d7e8c04) into master (c5b37e2) will decrease coverage by 0.14%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #279      +/-   ##
==========================================
- Coverage   96.86%   96.72%   -0.15%     
==========================================
  Files          19       19              
  Lines        2712     2716       +4     
==========================================
  Hits         2627     2627              
- Misses         85       89       +4     

Impacted Files	Coverage Δ
flask_restx/swagger.py	95.78% <0.00%> (-0.97%)	:arrow_down:

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[j5awry]

few things:

1. is there an issue associated with this change? i didn't see any discussion points around this anywhere
2. What is the issue and what is this trying to address? What's the rationale for this change?
3. There are no tests for this change. considering it's new functionality, for us to be able to include it, it'll need tests

I can't review this until the above three things are addressed.