docs: Complete the Python OpenFeature feature matrix

Co-Authored-By: rlamb@launchdarkly.com <4955475+kinyoklion@users.noreply.github.com>

Author: devin-ai-integration[bot]

README.md

@@ -38,7 +38,8 @@ This matrix mirrors the [feature matrix of the OpenFeature SDK for Python](https
 | ✅      | Logging                         | The provider logs through the logging configuration of the `Config` it is given.                                                                                                                                           |
 | ✅      | Domains                         | Domains bind clients to providers in the OpenFeature SDK; a separate provider instance may be registered per domain.                                                                                                       |
 | ✅      | Eventing                        | LaunchDarkly data source status changes are emitted as `PROVIDER_READY`, `PROVIDER_STALE` and `PROVIDER_ERROR`; flag changes as `PROVIDER_CONFIGURATION_CHANGED` with the changed flag key.                              |
-| ⚠️      | Initialization                  | The provider's `initialize` reports whether the LaunchDarkly client became ready, and a failure is reported as a non-fatal error so that cached or fallback flag data is still evaluated. It has no timeout of its own and waits until the data source becomes valid or permanently fails: [#55](https://github.com/launchdarkly/openfeature-python-server/issues/55). |
+| ✅      | Tracking                        | `track` sends a LaunchDarkly custom event for the evaluation context, with the tracking event value and remaining details attached.                                                                                        |
+| ⚠️      | Initialization                  | `initialize` reports whether the LaunchDarkly client became ready. It has no timeout of its own and waits until the data source becomes valid or permanently fails: [#55](https://github.com/launchdarkly/openfeature-python-server/issues/55). |
 | ✅      | Shutdown                        | `shutdown` closes the LaunchDarkly client; a closed client cannot be restarted, so a new provider instance is required afterward.                                                                                          |
 | ✅      | Transaction Context Propagation | Provided by the OpenFeature SDK, which merges the transaction context into the evaluation context before the provider is called; no provider support is required.                                                          |
 | ✅      | Extending                       | The underlying LaunchDarkly client is available through the `client` property.                                                                                                                                            |