Add discord-canary cask @ 0.0.181 (#4985)

* Add discord-canary cask @ 0.0.181

* appcast

Casks/discord-canary.rb

@@ -0,0 +1,24 @@
+cask 'discord-canary' do
+  version '0.0.181'
+  sha256 '5e32dd3bcf79d0b74f3d27ad30a941329767c0a6eeb9518b8c855e26dde61d05'
+
+  url "https://cdn-canary.discordapp.com/apps/osx/#{version}/DiscordCanary.dmg"
+  appcast 'https://discordapp.com/api/canary/updates?platform=osx',
+          checkpoint: '7075b599a2707a55a4601a83879752639d25c01a69fb96c2cae5aa54e5649243'
+  name 'Discord Canary'
+  homepage 'https://discordapp.com/'
+
+  auto_updates true
+
+  app 'Discord Canary.app'
+
+  zap trash: [
+               '~/Library/Application Support/discordcanary',
+               '~/Library/Caches/com.hnc.DiscordCanary',
+               '~/Library/Caches/com.hnc.DiscordCanary.ShipIt',
+               '~/Library/Cookies/com.hnc.DiscordCanary.binarycookies',
+               '~/Library/Preferences/com.hnc.DiscordCanary.helper.plist',
+               '~/Library/Preferences/com.hnc.DiscordCanary.plist',
+               '~/Library/Saved Application State/com.hnc.DiscordCanary.savedState',
+             ]
+end