Update `rubocop-cask` to 0.17.3.
Update `rubocop-cask` to 0.17.3.

reitermarkus/brew,EricFromCanada/brew,vitorgalvao/brew,mahori/brew,sjackman/homebrew,Linuxbrew/brew,Linuxbrew/brew,claui/brew,MikeMcQuaid/brew,konqui/brew,reitermarkus/brew,reitermarkus/brew,konqui/brew,ilovezfs/brew,maxim-belkin/brew,maxim-belkin/brew,claui/brew,sjackman/homebrew,mahori/brew,DomT4/brew,JCount/brew,konqui/brew,hanxue/linuxbrew,hanxue/linuxbrew,mgrimes/brew,mahori/brew,nandub/brew,nandub/brew,JCount/brew,EricFromCanada/brew,sjackman/homebrew,Homebrew/brew,EricFromCanada/brew,DomT4/brew,ilovezfs/brew,DomT4/brew,EricFromCanada/brew,reitermarkus/brew,Homebrew/brew,JCount/brew,hanxue/linuxbrew,nandub/brew,Linuxbrew/brew,claui/brew,JCount/brew,Homebrew/brew,mahori/brew,mgrimes/brew,Linuxbrew/brew,Homebrew/brew,vitorgalvao/brew,ilovezfs/brew,MikeMcQuaid/brew,nandub/brew,MikeMcQuaid/brew,konqui/brew,sjackman/homebrew,claui/brew,DomT4/brew,vitorgalvao/brew,MikeMcQuaid/brew,maxim-belkin/brew,vitorgalvao/brew,mgrimes/brew