stackdriver: update changelog before release

[djc]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.3%. Comparing base (56a6f45) to head (1f9343d).
Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #76     +/-   ##
=======================================
+ Coverage   52.3%   53.3%   +1.0%     
=======================================
  Files         38      38             
  Lines       4967    5026     +59     
=======================================
+ Hits        2598    2680     +82     
+ Misses      2369    2346     -23     

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[djc]

I published 6245c63 as opentelemetry-stackdriver 0.20.0. If someone wants to add a tag, that would be great.

[lalitb]

I published 6245c63 as opentelemetry-stackdriver 0.20.0. If someone wants to add a tag, that would be great.

Thanks @djc. Have created the tag on this commit-id.