cask fetch and upgrade: print caveats

Library/Homebrew/cask/lib/hbc/cli/fetch.rb

@@ -10,6 +10,7 @@ module Hbc
 
       def run
         casks.each do |cask|
+          Installer.print_caveats(cask)
           ohai "Downloading external files for Cask #{cask}"
           downloaded_path = Download.new(cask, force: force?).perform
           Verify.all(cask, downloaded_path)

Library/Homebrew/cask/lib/hbc/cli/upgrade.rb

@@ -53,6 +53,8 @@ module Hbc
             # Start new Cask's installation steps
             new_cask_installer.check_conflicts
 
+            new_cask_installer.print_caveats
+
             new_cask_installer.fetch
 
             # Move the old Cask's artifacts back to staging