Remove 3.8-dev test build

[codecov[bot]]

Codecov Report

Merging #533 into gonzobot will decrease coverage by 2.33%. The diff coverage is n/a.

@@             Coverage Diff              @@
##           gonzobot     #533      +/-   ##
============================================
- Coverage     48.01%   45.68%   -2.34%     
============================================
  Files           216      216              
  Lines         13609    13025     -584     
============================================
- Hits           6534     5950     -584     
  Misses         7075     7075

Impacted Files	Coverage Δ
plugins/jokes.py	31.74% <0%> (-13.13%)	:arrow_down:
plugins/core/core_out.py	30.76% <0%> (-9.24%)	:arrow_down:
plugins/core/core_hooks.py	28.57% <0%> (-8.93%)	:arrow_down:
plugins/admin_channel.py	21.84% <0%> (-8.75%)	:arrow_down:
plugins/admin_bot.py	14.36% <0%> (-8.03%)	:arrow_down:
plugins/deals.py	33.33% <0%> (-7.85%)	:arrow_down:
plugins/core/core_tracker.py	30.3% <0%> (-7.54%)	:arrow_down:
plugins/core/core_misc.py	17.39% <0%> (-7.37%)	:arrow_down:
plugins/karma.py	23.23% <0%> (-7.05%)	:arrow_down:
plugins/vimeo.py	33.33% <0%> (-6.67%)	:arrow_down:
... and 167 more

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