Add an option to pandoc.image.return so it can insert Markdown attributes

[adamryczkowski]

I use it with the pandoc-fignos pandoc plugin to insert image number.

If you don't have the pandoc-fignos, the pandoc should ignore any attributes.

The attribute argument is optional, and it can also be input by the R attribute attached to the path of the image as "pandoc_attributes".

I hope you don't have anything against it.

[adamryczkowski]

Can someone give me a feedback concerning my pull request? Would you consider it?

[adamryczkowski]

BTW, what exactly this CI problem mean? What can I do to fix it?

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@b0b475d). Click here to learn what that means.
The diff coverage is 76.19%.

@@            Coverage Diff            @@
##             master     #302   +/-   ##
=========================================
  Coverage          ?   79.52%           
=========================================
  Files             ?       12           
  Lines             ?     3556           
  Branches          ?        0           
=========================================
  Hits              ?     2828           
  Misses            ?      728           
  Partials          ?        0

Impacted Files	Coverage Δ
R/brew.R	84.94% <ø> (ø)
R/pandoc.R	88.88% <ø> (ø)
R/R5.R	95.74% <ø> (ø)
R/S3.R	83.84% <76.19%> (ø)

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[adamryczkowski]

Can anyone tell me, why you reject my pull request?