pip install cocos2d in python3.11 will raise error

[dantezhu]

1. execute cmd pip install cocos2d in python3.11
2. raise such error

   PS C:\Users\dantezhu> pip install cocos2d
   Looking in indexes: https://mirrors.aliyun.com/pypi/simple/
   Collecting cocos2d
     Downloading https://mirrors.aliyun.com/pypi/packages/2f/45/d3efb5f3e635adc5b49ee2b890910c672f4c98b927a820230abadde9c9bf/cocos2d-0.6.9.tar.gz (4.7 MB)
        ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 4.7/4.7 MB 6.3 MB/s eta 0:00:00
     Preparing metadata (setup.py) ... error
     error: subprocess-exited-with-error
     
     × python setup.py egg_info did not run successfully.
     │ exit code: 1
     ╰─> [7 lines of output]
         Traceback (most recent call last):
           File "<string>", line 2, in <module>
           File "<pip-setuptools-caller>", line 34, in <module>
           File "C:\Users\dantezhu\AppData\Local\Temp\pip-install-zor1doi2\cocos2d_eb6b1a6aeb7c4500be9ebf08cedc9408\setup.py", line 38, in <module>
             f = open('README.rst','rU')
                 ^^^^^^^^^^^^^^^^^^^^^^^
         ValueError: invalid mode: 'rU'
         [end of output]
     
     note: This error originates from a subprocess, and is likely not a problem with pip.
   error: metadata-generation-failed
   
   × Encountered error while generating package metadata.
   ╰─> See above for output.
   
   note: This is an issue with the package mentioned above, not pip.
   hint: See above for details.
   

[dangillet]

Thank you for the report. The issue is resolved by #355