fix: fix two-character elements

[njzjz]

fix #1536

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[codecov]

Codecov Report

Merging #1537 (d36af3d) into master (59da90f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1537   +/-   ##
=======================================
  Coverage   94.87%   94.88%           
=======================================
  Files          17       17           
  Lines        1406     1407    +1     
=======================================
+ Hits         1334     1335    +1     
  Misses         72       72           

Impacted Files	Coverage Δ
reacnetgenerator/_reachtml.py	98.43% <100.00%> (+0.01%)	⬆️

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[njzjz]

🎉 This PR is included in version 1.4.166 🎉

The release is available on GitHub release

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