torbrowser-zh.rb: upgrade to v4.5, update url and gpg key id

Casks/torbrowser-zh.rb

@@ -1,10 +1,10 @@
 cask :v1 => 'torbrowser-zh' do
-  version '4.0.8'
-  sha256 '661fb573ddde8a656e346108635e714b7be48a5165d80955e8d2235dada6cd2b'
+  version '4.5'
+  sha256 'f6a6a8f592aa4c5ca7f424033f791f34cf4b96c89f1182b97c02584652b8070b'
 
-  url "https://www.torproject.org/dist/torbrowser/#{version}/TorBrowser-#{version}-osx32_zh-CN.dmg"
+  url "https://dist.torproject.org/torbrowser/#{version}/TorBrowser-#{version}-osx64_zh-CN.dmg"
   gpg "#{url}.asc",
-      :key_id => '4e2c6e8793298290'
+      :key_id => 'ef6e286dda85ea2a4ba7de684e2c6e8793298290'
   homepage 'https://www.torproject.org/projects/torbrowser.html'
   license :oss