add https://github.com/liquidaty/zsv to the benchmark comparison

[liquidaty]

Hello and thank you for the dsq project, and this great benchmark analysis!

Would you mind to add https://github.com/liquidaty/zsv to this list? Usage:

zsv file1.csv "select * from data"
zsv file1.csv file2.csv "select * from data inner join data2 on data.a = data2.a"

Other info:
Caching: no
Engine: customized sqlite3
Supported file types: csv, tsv, txt with arbitrary delimiter, single- or multi-row header
Binary size: 2.2MB (bundle), 1.6MB (standalone sql utility)

(sorry, did not mean to open this in a manner that would automatically this a bug, but now I can't remove that)