『デモンスパイク』を追加

[ysakasin]

書籍情報：https://fujimi-trpg-online.jp/game/demonspike.html

[codecov]

Codecov Report

Patch coverage: 97.77% and no project coverage change.

Comparison is base (1b1565b) 95.59% compared to head (e1b7f96) 95.59%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #636   +/-   ##
=======================================
  Coverage   95.59%   95.59%           
=======================================
  Files         336      337    +1     
  Lines       19343    19388   +45     
  Branches     5032     5042   +10     
=======================================
+ Hits        18490    18534   +44     
- Misses        853      854    +1     

Files Changed	Coverage Δ
lib/bcdice/game_system/DemonSpike.rb	97.72% <97.72%> (ø)
lib/bcdice/game_system.rb	100.00% <100.00%> (ø)

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