add transmit 4 (#4190)

Casks/transmit4.rb

@@ -0,0 +1,17 @@
+cask 'transmit4' do
+  version '4.4.13'
+  sha256 '0d7095351378aa3c581de064f99fedecbfac683377048a4c0457976f5ce79f3b'
+
+  url "https://www.panic.com/transmit/d/Transmit%20#{version}.zip"
+  appcast "https://library.panic.com/releasenotes/transmit#{version.major}",
+          checkpoint: '87bb78821ca9d971cbcbdcdc70e69b9210fedbdea676f3b6c70855c593754101'
+  name 'Transmit'
+  homepage 'https://panic.com/transmit/'
+
+  app 'Transmit.app'
+
+  zap trash: [
+               '~/Library/Preferences/com.panic.Transmit.plist',
+               '~/Library/Application Support/Transmit',
+             ]
+end