itunes-producer.rb: fix multiple issues

Casks/itunes-producer.rb

@@ -1,22 +1,20 @@
 cask :v1 => 'itunes-producer' do
-  name 'iTunes Producer'
-
-  homepage 'https://itunesconnect.apple.com/WebObjects/iTunesConnect.woa/ra/ng/resources_page'
-  license :closed
-
-  pkg 'iTunesProducer.pkg'
-
-  if MacOS.release >= :mavericks
-    version '3.1'
-
-    url 'https://itunesconnect.apple.com/downloads/Software/iTunesProducer/iTunesProducer_3.1.dmg'
-    sha256 'c4b98602635757f4f40867585962b5283c89c7efea84f315a3d0d435b475f343'
-  else
+  if MacOS.release <= :mavericks
     version '2.9.1'
 
-    url 'https://itunesconnect.apple.com/itunesproducer/iTunesProducer_2.9.1.dmg'
+    url "https://itunesconnect.apple.com/itunesproducer/iTunesProducer_#{version}.dmg"
     sha256 '3e14f399e350f31e4b0e3c1833ef4bb0102912f67096440bd572b00a7f008257'
+  else
+    version '3.1'
 
-    depends_on :macos => '>= :snow_leopard'
+    url "https://itunesconnect.apple.com/downloads/Software/iTunesProducer/iTunesProducer_#{version}.dmg"
+    sha256 'c4b98602635757f4f40867585962b5283c89c7efea84f315a3d0d435b475f343'
   end
+
+  homepage 'https://itunesconnect.apple.com/WebObjects/iTunesConnect.woa/ra/ng/resources_page'
+  name 'iTunes Producer'
+  license :closed
+  pkg 'iTunesProducer.pkg'
+
+  depends_on :macos => '>= :snow_leopard'
 end