Update odsw.py

[vinraspa]

Add datetime.datetime support to pyexcel_ods3.odsw.ODSSheetWriter.write_row(array) method.
To be usable, this patch requires first that a pull request is accepted by pyexcel_io maintainers (datetime.datetime: "datetime" key:value pair must be added to ODS_WRITE_FORMAT_COVERSION dictionary..
Thank you

With your PR, here is a check list:

• Has test cases written?
• Has all code lines tested?
• Has make format been run?
• Please update CHANGELOG.yml(not CHANGELOG.rst)
• Has fair amount of documentation if your change is complex
• Agree on NEW BSD License for your contribution

[codecov-commenter]

Codecov Report

Merging #28 (ad14702) into dev (c4f8805) will decrease coverage by 0.31%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##              dev      #28      +/-   ##
==========================================
- Coverage   98.70%   98.38%   -0.32%     
==========================================
  Files          12       12              
  Lines         618      621       +3     
==========================================
+ Hits          610      611       +1     
- Misses          8       10       +2     

Impacted Files	Coverage Δ
pyexcel_ods3/odsw.py	96.49% <33.33%> (-3.51%)	⬇️

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