RELEASES.md: new driving model goes first

old-commit-hash: c5e96201f30c7168e531ba5da98775fcd2d668c5

RELEASES.md

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 Version 0.8.15 (2022-07-XX)
 ========================
+* New driving model
+  * Path planning uses end-to-end output instead of lane lines
 * New lateral controller based on physical wheel torque model
   * Much smoother control, consistent across the speed range
   * Effective feedforward that uses road roll
   * Simplified tuning, all car-specific parameters can be derived from data
   * Significantly improved control on TSS-P Prius
-* New driving model
-  * Path planning uses end-to-end output instead of lane lines
 * New driver monitoring model
   * Takes a larger input frame
   * Outputs a driver state for both driver and passenger