Update mix.exs

[solar05]

Fixes #ISSUE_ID

[codecov-commenter]

Codecov Report

Base: 73.05% // Head: 72.86% // Decreases project coverage by -0.18% ⚠️

Coverage data is based on head (59749e3) compared to base (c512f8e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1167      +/-   ##
==========================================
- Coverage   73.05%   72.86%   -0.19%     
==========================================
  Files         130      130              
  Lines        2657     2657              
==========================================
- Hits         1941     1936       -5     
- Misses        716      721       +5     

Impacted Files	Coverage Δ
services/app/lib/codebattle/bot/server.ex	77.46% <0.00%> (-5.64%)	⬇️
...es/app/lib/codebattle_web/channels/game_channel.ex	83.67% <0.00%> (-2.05%)	⬇️

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