adding Orcid ID to the contributors

[djarecka]

• adding orcidID to the contributors fields. It's added to nameIdentifiers list in to_datacite function.

fixes #102

[codecov]

Codecov Report

Merging #111 (8b3281d) into master (0099e5f) will decrease coverage by 6.05%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
- Coverage   96.61%   90.55%   -6.06%     
==========================================
  Files          18       18              
  Lines        1564     1567       +3     
==========================================
- Hits         1511     1419      -92     
- Misses         53      148      +95     

Flag	Coverage Δ
unittests	90.55% <33.33%> (-6.06%)	⬇️

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Impacted Files	Coverage Δ
dandischema/tests/test_datacite.py	48.88% <ø> (-51.12%)	⬇️
dandischema/datacite.py	50.90% <33.33%> (-44.42%)	⬇️

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[djarecka]

I'm not sure why codecov does't like me...