Added new cask, Discord PTB.app v0.0.10

Casks/discord-ptb.rb

@@ -0,0 +1,13 @@
+cask 'discord-ptb' do
+  version '0.0.10'
+  sha256 '2f9fe9e150f3fa1502366fb7caecaa5311655c1dc406168ae11c448e08ad4196'
+
+  url "https://cdn-ptb.discordapp.com/apps/osx/#{version}/DiscordPTB.dmg"
+  name 'Discord PTB'
+  homepage 'https://discordapp.com'
+  license :gratis
+
+  app 'Discord PTB.app'
+
+  zap delete: '~/Library/Preferences/com.hnc.DiscordPTB.plist'
+end