Add change summary to CHRE API v1.3

Test: n/a
Change-Id: Iad55a75c5b107a06a057c4497b342bdbcb60cb1b
diff --git a/chre_api/include/chre_api/chre/version.h b/chre_api/include/chre_api/chre/version.h
index 3b2bf6e..a7462fe 100644
--- a/chre_api/include/chre_api/chre/version.h
+++ b/chre_api/include/chre_api/chre/version.h
@@ -73,7 +73,10 @@
 /**
  * Value for version 1.3 of the Context Hub Runtime Environment API interface.
  *
- * The version of the CHRE API shipped with the Android Q release.
+ * The version of the CHRE API shipped with the Android Q release. It adds
+ * support for GNSS location altitude/speed/bearing accuracy. It also adds step
+ * detect as a standard CHRE sensor and supports bias event delivery and sensor
+ * data flushing.
  *
  * @see CHRE_API_VERSION
  */