chore: add link for Cloud SQL and IntelliJ (#613)

Cf. #612.

Co-authored-by: Shubha Rajan <[email protected]>

README.md

@@ -58,7 +58,7 @@ that are protected by a firewall may need to be configured to allow outgoing con
 
 ### Connect with IntelliJ
 
-In order to [connect IntelliJ](https://jetbrains.com/help/idea/connecting-to-a-database.html#mysql) 
+In order to [connect IntelliJ](https://www.jetbrains.com/help/datagrip/connect-to-google-cloud-sql-instances.html) 
 to your Cloud SQL instance, you will need to add this library as a jar with dependencies in
 "Additional Files" section on the driver settings page. Prebuilt fat jars can be found on the 
 [Releases](https://github.com/GoogleCloudPlatform/cloud-sql-jdbc-socket-factory/releases) page for