Remove appendleft()

[AdrianAtZyte]

Fixes #82.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.30%. Comparing base (e2a28fc) to head (7ec4068).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #118   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files           5        5           
  Lines         766      766           
  Branches      136      136           
=======================================
  Hits          753      753           
  Misses          1        1           
  Partials       12       12           

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