Remove iStat Menus 3

Casks/istat-menus3.rb

@@ -1,12 +0,0 @@
-cask :v1 => 'istat-menus3' do
-  version '3.27'
-  sha256 '31b613aad5b4228087696f0c928a6018f8606534acbb3917e55635c51073bdf6'
-
-  # amazonaws.com is the official download host per the vendor homepage
-  url "http://s3.amazonaws.com/bjango/files/istatmenus3/istatmenus#{version}.zip"
-  name 'iStats Menus'
-  homepage 'http://bjango.com/mac/istatmenus/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
-
-  app 'iStat Menus.app'
-end