Update release-notes.md

Update release date

docs/release-notes.md

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 # Release Notes
 
-## Version 15.1.0 (September 3, 2024)
+## Version 15.1.0 (September 4, 2024)
 As mentioned in the notes for Version 15.0.2, several improvements to the Commercial Vehicle Model (CVM) were made, largely due to SANDAG staff realizing that the survey used to estimate the CVM had likely overestimated the amount of commercial vehicle travel that was made on a given day in the region. New weights were estimated, and then the CVM was recalibrated to match these new weights. After doing this, it was found that modeled highway volumes were lower than observed counts, so some further adjustments were made to get them back up. Some components of the resident model were recalibrated to better match the survey, a new database started being used, a bug in the transit network was fixed, and other miscelaneous improvements were made.
 
 ### ActivitySim Version