Update Diffmerge cask to use new link syntax
@ -3,5 +3,5 @@ class Diffmerge < Cask
homepage 'http://www.sourcegear.com/diffmerge'
version '3.3.2'
sha1 '134ca0c88a63c01657e1d50cd05aa006c3a1529f'
link :app, 'DiffMerge.app'
link 'DiffMerge.app'
end