Please allow base-files 4.0.4 in testing

[Santiago Vila <sanvila@unex.es>]

base-files (4.0.4) unstable; urgency=low

  * Added Apache-2.0 to common-licenses. Closes: #471736.
    Retrieved from http://www.apache.org/licenses/LICENSE-2.0.txt.
  * Fixed typo in README.base. Closes: #475201.

Item 1 is already policy according to the debian-policy package in lenny.
Item 2 is a simple typo.

Thanks.