Being able to use schema.Time

[nilbacardit26]

Let me know what you think.I tried schema.Time() but it did not work

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (93b4567) 94.6% compared to head (c3b3768) 94.1%.

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Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1193     +/-   ##
========================================
- Coverage    94.6%   94.1%   -0.4%     
========================================
  Files         377     377             
  Lines       32771   32803     +32     
========================================
- Hits        30991   30858    -133     
- Misses       1780    1945    +165     

Files	Coverage Δ
guillotina/schema/_field.py	97.7% <100.0%> (+0.1%)	⬆️
guillotina/tests/test_api.py	99.7% <100.0%> (+0.1%)	⬆️
guillotina/tests/test_serialize.py	100.0% <100.0%> (ø)

... and 11 files with indirect coverage changes