add Guflly as a contributor for bug

[allcontributors]

Adds @Guflly as a contributor for bug.

This was requested by Incogdino in this comment

[Incogdino]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.32%. Comparing base (1192d73) to head (3da3838).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2916   +/-   ##
=======================================
  Coverage   71.32%   71.32%           
=======================================
  Files         133      133           
  Lines        7234     7234           
  Branches     1713     1682   -31     
=======================================
  Hits         5160     5160           
- Misses       1973     2068   +95     
+ Partials      101        6   -95     

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[github-actions]

@Incogdino Each PR must have a SEMVER impact label, please remember to label the PR properly.