Add torification of apt

README.md

@@ -19,6 +19,10 @@ apt-get install aspell-am aspell-ar aspell-ar-large aspell-bg aspell-bn aspell-b
 
 Copy (and modify according to your needs) the configuration files in etc to /etc after installation has finished.
 
+If you copied over the new etc/apt/sources.list file, we need to update our repository data and install a new keyring package for authenticating packages from torproject:
+```
+apt-get update && apt-get install deb.torproject.org-keyring
+```
 
 To allow sasl authentication, add postfix to the sasl group:
 ```