update readme

CHANGELOG.md

 ## 1.3.1
 
+### Features:
+ * revert default cross attention optimization to Doggettx
+
 ### Bug Fixes:
  * fix bug: LoRA don't apply on dropdown list sd_lora
  * fix png info always added even if setting is not enabled
@@ -7,6 +10,7 @@
  * fix "hires. fix" prompt sharing same labels with txt2img_prompt
  * fix lora hashes not being added properly to infotex if there is only one lora
  * fix --use-cpu failing to work properly at startup
+ * make --disable-opt-split-attention command line option work again
 
 ## 1.3.0