Update hyper-canary to 2.0.4 (#4507)

Casks/hyper-canary.rb

@@ -1,11 +1,11 @@
 cask 'hyper-canary' do
-  version '2.0.3'
-  sha256 '63e7b794ad30ed2d8f20fbdff62a7d5c924d12fa7d7acf947b5b6e326fc9d9b7'
+  version '2.0.4'
+  sha256 'db2540215f1aaaa164f992c9c7f58c76bd6a35c7e5ea662e06b00825e42a3b2f'
 
   # github.com/zeit/hyper was verified as official when first introduced to the cask
   url "https://github.com/zeit/hyper/releases/download/#{version}/hyper-#{version}-mac.zip"
   appcast 'https://github.com/zeit/hyper/releases.atom',
-          checkpoint: '3e6904e6ace6c8b67292010e3a8651f04d55142399409ab663b7997168ab23ed'
+          checkpoint: 'e9ffa6b15e4033dacd8a4fe8fdfb8de8cdec5354cdd35a61087fee5af64b48f4'
   name 'Hyper'
   homepage 'https://hyper.is/'