added link for upgrading from 2.4.2 to 2.5

git-svn-id: https://svn.apache.org/repos/asf/vcl/site/trunk@1820680 13f79535-47bb-0310-9956-ffa450edef68
1 file changed
tree: 6ac855b6c36ca09f6086652a643baa896ff9f631
  1. content/
  2. img/
  3. lib/
  4. templates/