Remove aptitude from sudoers

As defined in https://github.com/DE-IBH/apt-dater-host/blob/master/dpkg/scripts/apt-dater-host

Author: kallies

README.md

@@ -12,10 +12,10 @@ Setup hosts managed by apt-dater:
   Modify the sudoers rules, e.g. `/etc/sudoers` or `/etc/sudoers.d/apt-dater-host`:
 
 	Defaults env_reset,env_keep=MAINTAINER
-	the-user ALL=NOPASSWD: /usr/bin/apt-get, /usr/bin/aptitude, /usr/sbin/needrestart
+	the-user ALL=NOPASSWD: /usr/bin/apt-get, /usr/sbin/needrestart
 
   For non apt-based distributions you need to replace
-  `/usr/bin/apt-get, /usr/bin/aptitude` with the equivalent, e.g. `/usr/bin/yum`.
+  `/usr/bin/apt-get` with the equivalent, e.g. `/usr/bin/yum`.
 
   You can verify the setup by calling