change dependency to av gem version 0.9+

Author: attenzione

lib/paperclip/av/transcoder/version.rb

@@ -1,7 +1,7 @@
 module Paperclip
   module Av
     module Transcoder
-      VERSION = "0.6.3"
+      VERSION = "0.6.4"
     end
   end
 end

paperclip-av-transcoder.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rails", ">= 4.0.0"
   spec.add_development_dependency "sqlite3"
   spec.add_development_dependency "coveralls"
-  
+
   spec.add_dependency "paperclip", ">=2.5.2"
-  spec.add_dependency "av", "~> 0.8.1"
+  spec.add_dependency "av", "~> 0.9.0"
 end