Update Revision History June 2025 (#571)

* Update GTFS Schedule revision history

* Update revision date in GTFS Schedule Reference

Author: Sergiodero

gtfs/spec/en/reference.md

@@ -1,6 +1,6 @@
 ## General Transit Feed Specification Reference
 
-**Revised May 6, 2025. See [Revision History](https://gtfs.org/schedule/process/#revision-history) for more details.**
+**Revised July 9, 2025. See [Revision History](https://gtfs.org/schedule/process/#revision-history) for more details.**
 
 This document defines the format and structure of the files that comprise a GTFS dataset.
 

gtfs/spec/en/revision-history.md

@@ -1,5 +1,8 @@
 ### Revision History
 
+#### June 2025
+* Added cars_allowed field to trips.txt. See [discussion](https://github.com/google/transit/pull/547).
+
 #### April 2025
 * Added clarification to allow value 1 for continuous_pickup/continuous_drop_off for DRT services. See [discussion](https://github.com/google/transit/pull/558).