init: Do not include apt ourselves.

Using `include apt` causes problems. If someone in the catalogue does an
`class { 'apt: }` and we come after it with `include apt` this will
work. However if the order is reversed we'll get a duplicate resource
definition.

Closes #12

1 files changed, 3 insertions, 1 deletions

diff --git a/README.md b/README.md
index c266734..8c1581c 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,9 @@ The unattended\_upgrades module automates the configuration of apt package updat
 
 ### Beginning with unattended\_upgrades
 
-All you need to do is include the module `include unattended_upgrades`.
+All you need to do is include the apt module, `include apt`, and this module, `include unattended_upgrades` for it to work.
+
+This module relies on the [apt](https://forge.puppetlabs.com/puppetlabs/apt) module and will not work without it.
 
 ## Usage