Add Shimo.app v3.x (#2881)

Casks/shimo3.rb

@@ -0,0 +1,18 @@
+cask 'shimo3' do
+  version '3'
+  sha256 'b7ea5315ef77c0747735f5f5916f8b8727865134ac8f7c87bc00c582d0f68503'
+
+  # feingeist.io was verified as official when first introduced to the cask
+  url "https://www.feingeist.io/files/Shimo#{version}.zip"
+  name 'Shimo'
+  homepage 'https://www.shimovpn.com/'
+
+  app 'Shimo.app'
+
+  zap delete: [
+                '~/Library/Application Support/Shimo',
+                '~/Library/Preferences/com.chungwasoft.Shimo.plist',
+                '~/Library/Caches/com.chungwasoft.Shimo',
+                '/Library/PrivilegedHelperTools/com.chungwasoft.shimo.helper',
+              ]
+end