Add missing depedency for development unit test
Add missing depedency for development unit test

rstacruz/sinatra-assetpack,flywithmemsl/sinatra-assetpack,flywithmemsl/sinatra-assetpack,jwhitcraft/sinatra-assetpack,jwhitcraft/sinatra-assetpack,rstacruz/sinatra-assetpack,rstacruz/sinatra-assetpack,flywithmemsl/sinatra-assetpack,jwhitcraft/sinatra-assetpack