bumped highlights version

[ExpandingMan]

Doesn't appear that anything breaks.

[codecov-commenter]

Codecov Report

Merging #457 (d40e95a) into master (381de22) will increase coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #457      +/-   ##
==========================================
+ Coverage   74.05%   74.38%   +0.32%     
==========================================
  Files          26       26              
  Lines        1353     1413      +60     
==========================================
+ Hits         1002     1051      +49     
- Misses        351      362      +11     

Flag	Coverage Δ
unittests	74.38% <ø> (+0.32%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/rendering/pandocformats.jl	82.75% <0.00%> (-2.43%)	⬇️
src/rendering/miscformats.jl	85.89% <0.00%> (-1.61%)	⬇️
src/reader/reader.jl	89.47% <0.00%> (-0.92%)	⬇️
src/run.jl	83.92% <0.00%> (-0.38%)	⬇️
src/WeaveMarkdown/html.jl	81.45% <0.00%> (-0.13%)	⬇️
src/Weave.jl	52.12% <0.00%> (-0.05%)	⬇️
src/cache.jl	100.00% <0.00%> (ø)
src/reader/markdown.jl	98.03% <0.00%> (+0.03%)	⬆️
src/converter.jl	98.66% <0.00%> (+0.07%)	⬆️
src/WeaveMarkdown/markdown.jl	96.00% <0.00%> (+0.16%)	⬆️
... and 6 more

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