chore: use correct import path in README

Signed-off-by: Danju Visvanathan <danju.visvanathan@gmail.com>

Author: danjuv

README.md

@@ -193,14 +193,16 @@ This is essential for robust experimentation powered by feature flags.
 For example, a flag enhancing the appearance of a UI component might drive user engagement to a new feature; to test this hypothesis, telemetry collected by a [hook](#hooks) or [provider](#providers) can be associated with telemetry reported in the client's `track` function.
 
 ```python
+from openfeature.track import TrackingEventDetails
+
 # initialize a client
 client = api.get_client()
 
 # trigger tracking event action
 client.track(
     'visited-promo-page',
     evaluation_context=EvaluationContext(),
-    tracking_event_details=openfeature.TrackingEventDetails(99.77).add("currencyCode", "USD"),
+    tracking_event_details=TrackingEventDetails(99.77).add("currencyCode", "USD"),
     )
 ```