Add root/circuits to user/password list

For whatever reason, the default user on my OSX laptop when calling ssh
is "root". This seems wrong, but perhaps it's on someone else's mac too
and it will save them from forgetting to time [email protected] when
connnecting.

Author: fhunleth

config/target.exs

@@ -29,7 +29,7 @@ config :nerves,
 # * See https://hexdocs.pm/ssh_subsystem_fwup/readme.html for firmware updates
 
 config :nerves_ssh,
-  user_passwords: [{"circuits", "circuits"}]
+  user_passwords: [{"circuits", "circuits"}, {"root", "circuits"}]
 
 # Configure the network using vintage_net
 # See https://github.com/nerves-networking/vintage_net for more information