state that net/ldap gem is required
state that net/ldap gem is required

Signed-off-by: Richard Hulse <199d1c4e47cbae7fdb7148aed49c8195968a954c@radionz.co.nz>
rhulse/active_directory_auth,josecoelho/active_directory_auth,rhulse/active_directory_auth,josecoelho/active_directory_auth,rhulse/active_directory_auth,josecoelho/active_directory_auth