[Fix #419] Fixing timefield for django

[safwanrahman]

This fixes #419

[codecov-commenter]

Codecov Report

Base: 57.46% // Head: 49.81% // Decreases project coverage by -7.64% ⚠️

Coverage data is based on head (a9954e2) compared to base (278a0d0).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #426      +/-   ##
==========================================
- Coverage   57.46%   49.81%   -7.65%     
==========================================
  Files          12       12              
  Lines         898     1088     +190     
==========================================
+ Hits          516      542      +26     
- Misses        382      546     +164     

Impacted Files	Coverage Δ
django_elasticsearch_dsl/documents.py	56.14% <ø> (+1.05%)	⬆️
django_elasticsearch_dsl/fields.py	49.59% <50.00%> (-2.34%)	⬇️
...sticsearch_dsl/management/commands/search_index.py	26.12% <0.00%> (-12.92%)	⬇️
django_elasticsearch_dsl/registries.py	57.05% <0.00%> (-0.75%)	⬇️

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