Fix: References in CHANGELOG.md

[localheinz]

This PR

• fixes references in CHANGELOG.md after removing the 1.x branch

[codecov]

Codecov Report

Merging #260 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master   #260   +/-   ##
=======================================
  Coverage        80%    80%           
  Complexity       43     43           
=======================================
  Files             3      3           
  Lines           175    175           
=======================================
  Hits            140    140           
  Misses           35     35

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