Add `file` to Available validators
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isamu/weak_parameters,r7kamura/weak_parameters,isamu/weak_parameters,isamu/weak_parameters_sinatra,r7kamura/weak_parameters,kenchan0130/weak_parameters,kenchan0130/weak_parameters,kenchan0130/weak_parameters,isamu/weak_parameters,isamu/weak_parameters_sinatra,r7kamura/weak_parameters,isamu/weak_parameters_sinatra