Update release notes to add ActivitySim version

Author: bhargavasana

docs/release-notes.md

@@ -1,7 +1,10 @@
 # Release Notes
 
-## Version 15.0.0 (May 2024)
+## Version 15.0.0 (May 23, 2024)
 For use in the 2025 Region Plan (RP), SANDAG has developed a new activity-based travel model, known as ABM3. The biggest change from SANDAG’s previous ABM, ABM2+, is the transition from the Java-based CT-RAMP modeling platform to the open-source Python-based [ActivitySim](https://research.ampo.org/activitysim/) platform that has been developed by a consortium of public agencies (of which SANDAG is a founding member) for the past decade. ABM3 will be the first ActivitySim model to be used in production for planning purposes. While most of the model components from ABM3 were translated from ABM2+, there were several notable enhancements that were made, which are described below. Further, several models were either re-estimated and/or recalibrated to match 2022 data.
+### ActivitySim Version
+- [SANDAG/activitysim v15.0.0](https://github.com/SANDAG/activitysim/releases/tag/v15.0.0): This is based on a fork of the ActivitySim consortium repo and customized code in [BayDAG_estimation](https://github.com/SANDAG/activitysim/tree/BayDAG_estimation) branch.
+- [SANDAG/activitysim-cvm v15.0.0](https://github.com/SANDAG/activitysim-cvm/releases/tag/v15.0.0): This specific version of ActivitySim is required to run the new Commercial Vehicle Model (CVM) in ABM3. It is based on a fork of the ActivitySim repo under [CamSys](https://github.com/camsys/activitysim) and customized code in [time-settings](https://github.com/SANDAG/activitysim-cvm/tree/time-settings) branch.
 ### Features
 - [ABM PR 68](https://github.com/SANDAG/ABM/pull/68): The base year was updated from 2016 to 2022, allowing the behavioral models to reflect changes in travel behavior derived from the onset of the COVID-19 pandemic.
 - [ABM PR 65](https://github.com/SANDAG/ABM/pull/65): The zone system was transitioned from a 3-zone system (TAZ, MAZ, TAP) to a 2-zone system (TAZ, MAZ).