docs: update README with recent changes and specify version for pytorch-optimizer

Author: kohya-ss

README.md

@@ -14,6 +14,10 @@ The command to install PyTorch is as follows:
 
 ### Recent Updates
 
+Mar 20, 2025:
+- `pytorch-optimizer` is added to requirements.txt. Thank you to gesen2egee for PR [#1985](https://github.com/kohya-ss/sd-scripts/pull/1985). 
+  - For example, you can use CAME optimizer with `--optimizer_type "pytorch_optimizer.CAME" --optimizer_args "weight_decay=0.01"`.
+
 Mar 6, 2025:
 
 - Added a utility script to merge the weights of SD3's DiT, VAE (optional), CLIP-L, CLIP-G, and T5XXL into a single .safetensors file. Run `tools/merge_sd3_safetensors.py`. See `--help` for usage. PR [#1960](https://github.com/kohya-ss/sd-scripts/pull/1960)

requirements.txt

@@ -9,6 +9,9 @@ pytorch-lightning==1.9.0
 bitsandbytes==0.44.0
 lion-pytorch==0.0.6
 schedulefree==1.4
+pytorch-optimizer==3.5.0
+prodigy-plus-schedule-free==1.9.0
+prodigyopt==1.1.2
 tensorboard
 safetensors==0.4.4
 # gradio==3.16.2
@@ -42,7 +45,4 @@ rich==13.7.0
 # for T5XXL tokenizer (SD3/FLUX)
 sentencepiece==0.2.0
 # for kohya_ss library
-pytorch-optimizer
-prodigy-plus-schedule-free==1.9.0
-prodigyopt==1.1.2
 -e .