Update changelog with fixed peer review issues

[nicolelink33]

• In response to Issue Peer Review (Raghav Gupta) #67: updated median.py function to always return a float.
• In response to Issue Peer Review (Raghav Gupta) #67 and Issue Peer Review (Joel Peterson) #65: validate_list now rejects NaN/Inf values.
• In response to Issue Peer review of this project from Harry Yau #64: Fixed installation method through pip install -i https://test.pypi.org/simple/ dumbpy

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.26%. Comparing base (2f99472) to head (ff38f4b).
⚠️ Report is 12 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev      #82   +/-   ##
=======================================
  Coverage   98.26%   98.26%           
=======================================
  Files          10       10           
  Lines         288      288           
  Branches       13       13           
=======================================
  Hits          283      283           
  Misses          4        4           
  Partials        1        1           

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