update about pyautogen 0.2

[sonichi]

Why are these changes needed?

update the news about pyautogen v0.2

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ba5a07a) 27.77% compared to head (dbe45b6) 27.77%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #826   +/-   ##
=======================================
  Coverage   27.77%   27.77%           
=======================================
  Files          27       27           
  Lines        3500     3500           
  Branches      794      794           
=======================================
  Hits          972      972           
  Misses       2457     2457           
  Partials       71       71           

Flag	Coverage Δ
unittests	27.71% <ø> (ø)

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[thinkall]

LGTM. Thanks.