add return annotation to parse_events

[lev-blit]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.93%. Comparing base (e1214da) to head (c251e83).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #175   +/-   ##
=======================================
  Coverage   91.93%   91.93%           
=======================================
  Files           4        4           
  Lines         397      397           
  Branches       99       99           
=======================================
  Hits          365      365           
  Misses         14       14           
  Partials       18       18           

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