Remove cocoapods0 (#4132)

Casks/cocoapods0.rb

@@ -1,19 +0,0 @@
-cask 'cocoapods0' do
-  version '0.39.0'
-  sha256 '51c5d0117272a9b3c30c15dd0a9776574a23c5d810ec0c4b298b0ce4c483f27f'
-
-  # github.com/CocoaPods/CocoaPods was verified as official when first introduced to the cask
-  url "https://github.com/CocoaPods/CocoaPods-app/releases/download/#{version}/CocoaPods.app-#{version}.tar.bz2"
-  name 'CocoaPods.app'
-  homepage 'https://cocoapods.org/'
-
-  container type: :tar
-
-  app 'CocoaPods.app'
-  binary "#{appdir}/CocoaPods.app/Contents/Helpers/pod"
-
-  postflight do
-    # Because Homebrew-Cask symlinks the binstub directly, stop the app from asking the user to install the binstub.
-    system 'defaults write org.cocoapods.CocoaPods CPDoNotRequestCLIToolInstallationAgain YES'
-  end
-end