Create dash3.rb (#3338)

* Create dash3.rb

* Update checkpoint

Casks/dash3.rb

@@ -0,0 +1,25 @@
+cask 'dash3' do
+  version '3.4.3'
+  sha256 '752c7b966709afa35759396b0b79172e8d2c54aff4c00ba9c01b3dd294df786b'
+
+  url "https://kapeli.com/downloads/v#{version.major}/Dash.zip"
+  appcast "https://kapeli.com/Dash#{version.major}.xml",
+          checkpoint: '8f674d3070ac1650ccdb286030e843c5ba41afdd4a5df002a9c956193bc35a89'
+  name 'Dash'
+  homepage 'https://kapeli.com/dash'
+
+  auto_updates true
+
+  app 'Dash.app'
+
+  postflight do
+    suppress_move_to_applications
+  end
+
+  zap delete: [
+                '~/Library/Application Support/Dash',
+                '~/Library/Application Support/com.kapeli.dashdoc',
+                '~/Library/Preferences/com.kapeli.dash.plist',
+                '~/Library/Preferences/com.kapeli.dashdoc.plist',
+              ]
+end