Refresh command to do update checks

[andsens]

Thought I'd give a little inspiration for a (IMO) very useful command I implemented in the bash version: refresh
It checks if a castle has been pulled the last N days and prompts the user to pull if they have not. This goes very well with a .bashrc or .zshrc file.
description
implementation

[christianbundy]

Personally, I don't think that I'd use it – but if there's a desire for it I'd be happy to implement it eventually.