Update libreoffice-still.rb (#5001)

Casks/libreoffice-still.rb

@@ -5,11 +5,12 @@ cask 'libreoffice-still' do
   # documentfoundation.org was verified as official when first introduced to the cask
   url "http://download.documentfoundation.org/libreoffice/stable/#{version}/mac/x86_64/LibreOffice_#{version}_MacOS_x86-64.dmg"
   appcast 'https://download.documentfoundation.org/libreoffice/stable/',
-          checkpoint: '8df6eaec89e8697b47cb460dee988e576bb735214d697ee7a24b65d6d1302d87'
+          checkpoint: 'e10b6d6d5b9d7d21174049291ce78cb5eca63d91ccf5aaed3f0b6715022629ca'
   name 'LibreOffice Still'
   homepage 'https://www.libreoffice.org/download/libreoffice-still/'
   gpg "#{url}.asc", key_id: 'c2839ecad9408fbe9531c3e9f434a1efafeeaea3'
 
+  auto_updates true
   conflicts_with cask: [
                          'libreoffice',
                          'libreoffice-rc',