docs: add TonyDMorris as a contributor

[allcontributors[bot]]

Adds @TonyDMorris as a contributor for bug.

This was requested by danielgrijalva in this comment

[codecov[bot]]

Codecov Report

Merging #150 into master will decrease coverage by 43.19%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
- Coverage   55.77%   12.57%   -43.2%     
==========================================
  Files          89       70      -19     
  Lines        1698      803     -895     
  Branches       91       91              
==========================================
- Hits          947      101     -846     
+ Misses        668      619      -49     
  Partials       83       83

Impacted Files	Coverage Δ
backend/users/tests.py
backend/actions/apps.py
backend/users/serializers.py
backend/actions/serializers.py
backend/actions/utils.py
backend/users/models.py
backend/actions/tests.py
backend/actions/models.py
backend/games/apps.py
backend/games/views.py
... and 9 more

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