polygon field added

[soheildsh]

I tried to add polygon field from geodjango. thanks for you consideration.

[codecov-io]

Codecov Report

Merging #155 (60929b6) into master (480b6b9) will decrease coverage by 1.16%. The diff coverage is 80.26%.

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
- Coverage   93.67%   92.51%   -1.17%     
==========================================
  Files           9        9              
  Lines         759      855      +96     
==========================================
+ Hits          711      791      +80     
- Misses         48       64      +16     

Impacted Files	Coverage Δ
drf_extra_fields/geo_fields.py	86.95% <78.57%> (-5.73%)	:arrow_down:
tests/test_fields.py	95.02% <81.25%> (-1.81%)	:arrow_down:
drf_extra_fields/fields.py	90.05% <0.00%> (+0.17%)	:arrow_up:

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[alicertel]

Hi @yekmolsoheil Thank you for the great addition. I've made a suggestion to make it more compatible with django's Polygon field.

[soheildsh]

Hi. I'm on it. Soon I will also add the things that you said. thanks for your consideration and excellent review and additions.

[soheildsh]

Hey. Polygons with interior rings are added to be supported. also the tests have been passed. Can you now try to review this one more time. If the code is ok we may proceed to add this feature. Thanks