Update CHANGELOG.md

[RiccardoM]

Description

Moved the polls fix line to the new 0.4.2 version

Checklist

• [ ] Targeted PR against correct branch.
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Wrote unit tests.
• [ ] Run flutter format.
• [ ] Updated the documentation.
• [ ] Added an entry to the CHANGELOG.md file.
• [ ] Re-reviewed Files changed in the Github PR explorer.

[codecov[bot]]

Codecov Report

Merging #90 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #90   +/-   ##
=======================================
  Coverage   17.72%   17.72%           
=======================================
  Files         258      258           
  Lines        6290     6290           
=======================================
  Hits         1115     1115           
  Misses       5175     5175           

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