Add Keyboard Maestro v6.4.8

no_dots instead of delete('.')

Casks/keyboard-maestro6.rb

@@ -0,0 +1,14 @@
+cask 'keyboard-maestro6' do
+  version '6.4.8'
+  sha256 '74276c1bbb2f3b6f188e3883519c6f94cca333b40dd5a38ef79af37c3d6c5c06'
+
+  # stairways.com is the official download host per the vendor homepage
+  url "https://files.stairways.com/keyboardmaestro-#{version.no_dots}.zip"
+  name 'Keyboard Maestro'
+  homepage 'https://www.keyboardmaestro.com/'
+  license :commercial
+
+  depends_on macos: '>= :mountain_lion'
+
+  app 'Keyboard Maestro.app'
+end