[Fix #419] Fixing timefield for django

[safwanrahman]

This fixes #419

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 49.81%. Comparing base (278a0d0) to head (a9954e2).
Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
django_elasticsearch_dsl/fields.py	50.00%	3 Missing ⚠️

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HEAD has 60 uploads less than BASE

Flag	BASE (278a0d0)	HEAD (a9954e2)
	108	48

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     

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