Update usage_analytics.md

Author: glebmezh

docs/usage_analytics.md

@@ -9,6 +9,7 @@ We capture two events: one when the data-diff run starts, and one when it is fin
 - Sizes of tables diffed, run time, and diff row count (numbers only)
 - Error message, if any, truncated to the first 20 characters.
 - A persistent UUID to indentify the session, stored in `~/.datadiff.toml`
+- IP address of the machine running diff
 
 When using the `--dbt` feature, we also collect:
 
@@ -27,4 +28,4 @@ To disable, use one of the following methods:
     import data_diff
     # Invoke the following before making any API calls
     data_diff.disable_tracking()
-    ```
+    ```