👌 Nested parse attribution in attr_block

[chrisjsewell]

This is in keeping with the restructured text implementation, e.g.

  Hallo

  -- Chris Sewell `link <https://source.com>`__

tokenizes to:

<document source="test.rst">
    <block_quote>
        <paragraph>
            Hallo
        <attribution>
            Chris Sewell 
            <reference name="link" refuri="https://source.com">
                link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (635d74f) 90.26% compared to head (c7a35c7) 90.26%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #831   +/-   ##
=======================================
  Coverage   90.26%   90.26%           
=======================================
  Files          23       23           
  Lines        2969     2970    +1     
=======================================
+ Hits         2680     2681    +1     
  Misses        289      289           

Flag	Coverage Δ
pytests	90.26% <100.00%> (+<0.01%)	⬆️

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