highlight batch insert as key feature

So someone like me don't get confused and ends up exploring `http` interface with [clickhouse-bulk](https://github.com/nikepan/clickhouse-bulk)

README.md

@@ -7,6 +7,7 @@ Golang SQL database driver for [Yandex ClickHouse](https://clickhouse.yandex/)
 * Uses native ClickHouse tcp client-server protocol
 * Compatibility with `database/sql`
 * Round Robin load-balancing
+* Bulk write support :  `begin->prepare->(in loop exec)->commit`
 
 ## DSN