🐛 FIX: Newline not rendered in image alt attribute

[hukkin]

This is a sibling of the upstream PR markdown-it/markdown-it#775

[codecov]

Codecov Report

Merging #157 (84936c2) into master (7d44103) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #157   +/-   ##
=======================================
  Coverage   96.32%   96.32%           
=======================================
  Files          72       72           
  Lines        3266     3268    +2     
=======================================
+ Hits         3146     3148    +2     
  Misses        120      120           

Flag	Coverage Δ
pytests	96.32% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
markdown_it/renderer.py	100.00% <100.00%> (ø)

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