Bump version

[qingyun-wu]

Why are these changes needed?

• Bump version to 0.3.2
• Minor change in readme

Related issue number

Checks

• I've included any doc changes needed for https://autogenhub.github.io/autogen/. See https://autogenhub.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[sonichi]

Shall we comment out the banner for the NuGet package and recover the # downloads/month banner for pyautogen? Also comment out the news for AutoGen.NET? They can be moved to a new separate repo for .NET.

[marklysze]

Shall we comment out the banner for the NuGet package and recover the # downloads/month banner for pyautogen? Also comment out the news for AutoGen.NET? They can be moved to a new separate repo for .NET.

Agreed on the nuget package and AutoGen.NET commenting out. [DONE]

[marklysze]

Are we going back to Aug as the date (instead of Oct)?

[qingyun-wu]

I am fine either way. The autogen-ai org was created in Aug, and on Oct we moved here.