Bump version to 1.0.3 in pyproject.toml and clarify PSNR parameter description in README.md for improved user understanding

Author: developer0hye

README.md

@@ -56,7 +56,7 @@ imgdiet --source <input_path> --target <output_path> [--psnr <value>] [--verbose
 
 - `--source`: Path to an image or a directory containing images.
 - `--target`: Path to the output directory or a single WebP file.
-- `--psnr`: Target Peak Signal-to-Noise Ratio (default: 40.0). Use `0` for lossless compression.
+- `--psnr`: Target Peak Signal-to-Noise Ratio (default: 40.0). Use `0` for lossless compression. Higher values mean better quality but larger file size.
 - `--verbose`: Enable detailed logging for the process.
 
 #### Examples:

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "imgdiet"
-version = "1.0.2"
+version = "1.0.3"
 description = "A Python package for minimizing file size of images with minimal quality loss"
 readme = {file = "README.md", content-type = "text/markdown"}
 authors = [ { name="Yonghye Kwon", email="developer.0hye@gmail.com" } ]