project: bump CHANGELOG for 0.3.0

[twittemb]

Description

This PR supports the release of the version 0.3.0 Beryllium

Checklist

• [X] this PR is based on the main branch and is up-to-date, if not please rebase your branch on the top of main
• [X] the commits inside this PR have explicit commit messages
• [X] unit tests cover the new feature or the bug fix
• [X] the feature is documented in the README.md if it makes sense
• [X] the CHANGELOG is up-to-date

[codecov-commenter]

Codecov Report

Merging #15 (6d3d520) into improve/handle-error-withLatestFrom (db10b3f) will increase coverage by 0.04%. The diff coverage is n/a.

:exclamation: Current head 6d3d520 differs from pull request most recent head f927f6a. Consider uploading reports for the commit f927f6a to get more accurate results

@@                           Coverage Diff                           @@
##           improve/handle-error-withLatestFrom      #15      +/-   ##
=======================================================================
+ Coverage                                97.49%   97.53%   +0.04%     
=======================================================================
  Files                                       50       50              
  Lines                                     2471     2471              
=======================================================================
+ Hits                                      2409     2410       +1     
+ Misses                                      62       61       -1     

Impacted Files	Coverage Δ
.../Operators/AsyncSequence+SwitchToLatestTests.swift	95.58% <0.00%> (+1.47%)	:arrow_up:

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