Update package readme for 1.3

Author: lukash

package_README.md

@@ -2,23 +2,22 @@
 
 A full-featured self-balancing skateboard package.
 
-## New in 1.2
-- BMS alerting support (Pushback and Haptic)
-- Speed-based alerting (Pushback and Haptic)
-- Automatic config migration when updating the package
-- Support for per-cell High/Low Voltage Thresholds (no more needing to adjust them in Specs after a fresh install, 6.05+ only)
-- Groundworks for a new alerting system, for now only providing firmware fault reporting
-- New Rainbow Fade, Rainbow Cycle and Rainbow Roll LED effects
+## New in 1.3
+This version reworks a lot of the core control mechanisms and corrects a number of minor inaccuracies, which impacts behavior. Due to this, as well as due to the added Setpoint Smoothing, boards will behave slightly differently and tunes might need adjusting.
 
-For more details, read the [1.2 release post](https://pev.dev/t/refloat-version-1-2/2795).
+Changelog highlights:
+- Improved package-side control loop timing
+- Independence of config options and internal constants on the loop frequency
+- Compensation for different motors' torque constant (6.06+)
+- Setpoint smoothing for all tilts (Torque Tilt, ATR, Turn Tilt, Brake Tilt, Remote)
+
+For more details, read the [1.3 release post](https://www.youtube.com/watch?v=dQw4w9WgXcQ).
 
 ## Installation
 ### Upgrading
-Back up your package config (either by **Backup Configs** on the Start page, or by saving the XML on **Refloat Cfg**).
-
-If upgrading from Refloat 1.1 to 1.2, an automatic config restore dialog should pop up. Confirm it to restore. This is the preferred way to update the config from now on, as it will also migrate any changed options to the new version. Other methods of restoring the config will not do that.
+Back up your package config just in case (either by **Backup Configs** on the Start page, or by saving the XML on **Refloat Cfg**).
 
-In case the automatic config restore fails, restore it the traditional way and please report the issue, so that it can be fixed.
+Unless upgrading from 1.0, an automatic config restore will pop up, confirm it. If this fails, restore the manual backup.
 
 ### Fresh Installation
 If doing a fresh board installation, you need to do the **motor** and **IMU** calibration and configuration. If you install the package before that, you need to disable the package before running the **motor** _calibration_ and re-enable it afterwards.