Encode title and attributes of HTML tables

[hugovk]

Thank you to Sjoerd Langkemper (@Sjord) for the report.

[codecov]

Codecov Report

Merging #256 (17fbec8) into main (f44a274) will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #256      +/-   ##
==========================================
+ Coverage   94.83%   95.00%   +0.16%     
==========================================
  Files           5        5              
  Lines        2361     2361              
==========================================
+ Hits         2239     2243       +4     
+ Misses        122      118       -4     

Flag	Coverage Δ
macos-latest	94.91% <100.00%> (+0.12%)	⬆️
ubuntu-latest	94.95% <100.00%> (+0.16%)	⬆️
windows-latest	94.91% <100.00%> (+0.16%)	⬆️

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

Files Changed	Coverage Δ
src/prettytable/prettytable.py	91.61% <100.00%> (+0.28%)	⬆️
tests/test_prettytable.py	100.00% <100.00%> (ø)

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