Merge pull request Homebrew#1196 from reitermarkus/dmg-metadata

Add `.com.apple.timemachine.supported` to DMG_METADATA_FILES.

Author: reitermarkus

Library/Homebrew/cask/lib/hbc/container/dmg.rb

@@ -94,6 +94,7 @@ def skip_path?(path)
       DMG_METADATA_FILES = %w[
                              .background
                              .com.apple.timemachine.donotpresent
+                             .com.apple.timemachine.supported
                              .DocumentRevisions-V100
                              .DS_Store
                              .fseventsd