Drupal version in REAMDE

In this part of README it talks about Drupal 4.8, which is outdated since the current versions are 4.7.6 and 5.1.

-------------- IMPORTANT --------------------------------------------------
-------------- IMPORTANT --------------------------------------------------

If you update Views or any module that uses Views, you MUST MUST MUST
go and resubmit the admin/modules page. Views caches information provided
by modules, and this information MUST be re-cached whenever an update
is performed.

DRUPAL CANNOT TELL AUTOMATICALLY IF YOU HAVE UPDATED CODE. Therefore you
must go and submit this page.

Hopefully in 4.8 this won't be an issue.