Update compare project to latest versions

[Mingun]

Allow to benchmarking latest available versions. Because performance of maybe_xml degraded by 2 times, I kept version 0.10 which was (and still is) the fastest XML parser.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.53%. Comparing base (254fbd2) to head (15a3e86).
Report is 21 commits behind head on master.

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@@            Coverage Diff             @@
##           master     #872      +/-   ##
==========================================
- Coverage   60.74%   58.53%   -2.22%     
==========================================
  Files          41       42       +1     
  Lines       16044    17066    +1022     
==========================================
+ Hits         9746     9989     +243     
- Misses       6298     7077     +779     

Flag	Coverage Δ
unittests	58.53% <ø> (-2.22%)	⬇️

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[dralley]

Why did maybe_xml performance degrade? Because if it was perhaps for some spec-compliance reason, IMO the thing that would make the most sense to track the latest version - because it's not like we subject quick-xml to the same handicap (though we obviously don't have 100% compliance)

[Mingun]

Why did maybe_xml performance degrade?

I don't know, but when I studied the source code of maybe_xml 0.10, it seemed to me very logical and straightforward. It almost correctly parse well-formed documents (except for inline DTD declarations). It could be ideal for situations where you are sure that you have valid documents without DTD (which is anyway rarely used because replaced by XML Schema). That is why I want to keep it in the comparison as an ideal to strive for.

The slowdown is most likely due to the fact that in version 0.11 the parser now checks the validity of characters during parsing in each state, and not just looks for boundaries of events (like it did in 0.10 and as quick-xml does).

@bluk, just that you know