fix 0.15.1

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Runtime :

aw 0.1.13 ~> 0.1.0

defi 1.1.5 ~> 1.1.0

spectus 2.10.0 ~> 2.10.0

Development :

bundler 1.17.3 ~> 1.10

rake 10.5.0 ~> 10.4

rubocop 0.93.1 ~> 0.34

simplecov 0.22.0 ~> 0.10

yard 0.9.37 ~> 0.8