Update README.md

Signed-off-by: Maxim Babichev <maksim.babichev95@gmail.com>

Author: rez1dent3

README.md

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+We switched to the standard mysql/postgres interface from clickhouse. More details here: https://clickhouse.com/docs/en/interfaces/mysql
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 # Laravel Clickhouse
 
 [![Build Status](https://travis-ci.org/bavix/laravel-clickhouse.svg?branch=master)](https://travis-ci.org/bavix/laravel-clickhouse)