Add Vaporetto tokenizer to README

[vbkaisetsu]

We are developing a fast tokenizer named Vaporetto for Japanese.
Could you add vaporetto_tantivy to README?

Project page: https://github.com/legalforce-research/vaporetto
Tokenization models: https://github.com/legalforce-research/vaporetto/releases/tag/v0.3.0

[fulmicoton]

Sure ! Good job!

[codecov-commenter]

Codecov Report

Merging #1271 (a248a58) into main (e665322) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1271   +/-   ##
=======================================
  Coverage   94.22%   94.22%           
=======================================
  Files         209      209           
  Lines       35295    35295           
=======================================
+ Hits        33255    33256    +1     
+ Misses       2040     2039    -1     

Impacted Files	Coverage Δ
src/postings/postings_writer.rs	97.41% <0.00%> (-0.65%)	⬇️
src/indexer/segment_updater.rs	94.42% <0.00%> (+0.12%)	⬆️
src/postings/stacker/expull.rs	94.27% <0.00%> (+0.44%)	⬆️

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