make it possible to add an author with a comment including e.g. an ORCID

[maelle]

cf #65 (in preparation for the PR I intend to do for #63 )

One thing I wasn't sure about is whether you can add anything to the comment field, or whether there's a limited number of named strings that can go in there. I wasn't able to find that in "Writing R extensions" (where the ORCID support isn't documented yet anyway).

[codecov-io]

Codecov Report

Merging #69 into master will decrease coverage by 1.22%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
- Coverage     100%   98.77%   -1.23%     
==========================================
  Files          18       18              
  Lines        1131     1065      -66     
==========================================
- Hits         1131     1052      -79     
- Misses          0       13      +13

Impacted Files	Coverage Δ
R/authors-at-r.R	98.43% <100%> (-1.57%)	⬇️
R/assertions.R	93.33% <75%> (-6.67%)	⬇️
R/built.R	87.5% <0%> (-12.5%)	⬇️
R/remotes.R	95.65% <0%> (-4.35%)	⬇️
R/description.R	97.51% <0%> (-2.49%)	⬇️
R/collate.R	98.18% <0%> (-1.82%)	⬇️
R/str.R	100% <0%> (ø)	⬆️
R/classes.R	100% <0%> (ø)	⬆️
... and 7 more

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[maelle]

I can't reproduce the Travis failure locally 🤔

[maelle]

Oh I know why it fails!

One of the tests I've added checks that one can add an ORCID. I check for the string resulting from format. In the newer R versions format formats the ORCID (to an URL), whereas it doesn't for older R versions.

I'll add some skipping.

[gaborcsardi]

Thanks!