Add note to hubspot docs about event tester (#2286)

* add note to hubspot docs about event tester

* Update src/connections/destinations/catalog/hubspot/index.md

Co-authored-by: markzegarelli <mark.zegarelli@segment.com>

Co-authored-by: markzegarelli <mark.zegarelli@segment.com>

Author: kdaswani

src/connections/destinations/catalog/hubspot/index.md

@@ -7,6 +7,9 @@ cmode-override: true
 
 [HubSpot](https://www.hubspot.com/) is an inbound marketing and sales platform that helps companies attract visitors, convert leads, and close customers. The `analytics.js` HubSpot Destination is open-source. You can browse the code [on GitHub](https://github.com/segmentio/analytics.js-integrations/tree/master/integrations/hubspot).
 
+> warning ""
+> The HubSpot destination is not compatible with the Segment Event Tester. As result, Segment recommends using other tools to troubleshoot the HubSpot destination.
+
 
 ## Getting Started
 
@@ -215,7 +218,6 @@ analytics.ready(function(){
 })
 ```
 
-
 ## Using HubSpot with Personas
 
 You can send computed traits and audiences that you create in Personas to HubSpot so you can use the data in live chat, automated emails, and other HubSpot features to personalize interactions with your customers.