update readme and setup

README.md

@@ -84,7 +84,7 @@ fsspec_fits.getheader(filename=in_image_path, ext=1, s3_options=s3_options)
 #### 老写法
  ```python
 fits.getdata(in_ref_flat)
-fits.getdata( in_ref_shutter, 1)
+fits.getdata( in_ref_shutter, ext=1)
 ```
 usage reference:
 [https://docs.astropy.org/en/stable/io/fits/api/files.html#getdata](https://docs.astropy.org/en/stable/io/fits/api/files.html#getdata)  
@@ -94,8 +94,8 @@ usage reference:
 from csst_fs import fsspec_fits
 fsspec_fits.getdata(in_ref_flat)
 fsspec_fits.getdata(in_ref_flat, s3_options=s3_options)
-fsspec_fits.getdata( in_ref_shutter, 1)
-fsspec_fits.getdata( in_ref_shutter, 1, s3_options=s3_options)
+fsspec_fits.getdata( in_ref_shutter, ext=1)
+fsspec_fits.getdata( in_ref_shutter, s3_options=s3_options, ext=1)
 ```
 
 ### header.tofile

setup.py

@@ -5,9 +5,9 @@ setup(
     version='0.1.0',
     packages=find_packages(),
     install_requires=[
-        'astropy==5.3',
-        'fsspec==2024.5.0',
-        's3fs==2024.5.0'
+        'astropy>=5.3',
+        'fsspec>=2024.5.0',
+        's3fs>=2024.5.0'
     ],
     python_requires='>=3.9',
     description='csst pipeline handle file in local file system and remote s3  file system',