readme: point to julialang/julia

[mlechu]

Fix #609. TODO: link to julia backport branches

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.48%. Comparing base (99e975a) to head (53d9038).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #610      +/-   ##
==========================================
+ Coverage   94.72%   95.48%   +0.76%     
==========================================
  Files          15       16       +1     
  Lines        4262     4473     +211     
==========================================
+ Hits         4037     4271     +234     
+ Misses        225      202      -23     

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[topolarity]

Thanks!

[topolarity]

Merged this maybe a bit soon:

TODO: link to julia backport branches

Also we should point to the JuliaSyntax/ subdirectory in JuliaLang/julia - in any case, I'm glad to have some notice up