replace clickhouse.tech to clickhouse.com

Author: Slach

README.md

@@ -2,7 +2,7 @@
 
 # Altinity Grafana datasource plugin for ClickHouse® (grafana Grafana 4.6+ supported)
 
-Altinity ClickHouse datasource plugin provides a support for [ClickHouse](https://clickhouse.tech) as a backend database.
+Altinity ClickHouse datasource plugin provides a support for [ClickHouse](https://clickhouse.com) as a backend database.
 
 Initially plugin developed by Vertamedia, maintaned by Altinity since 2020.