✨ Add an eshell alias for upgrading homebrew stuff

I need to do this better really. At the moment it assumes I'm on macOS, and
needing to update stuff via homebrew. While it's increasingly rare, I do
still work on GNU/Linux at times. When I get a moment I should improve this
so it's more akin to what I do in fish:

https://github.com/davep/fish/blob/master/conf.d/abbr.d/updates.fish

Author: davep

.eshell/alias

@@ -3,3 +3,4 @@ alias c clear t
 alias d ls
 alias v ls -l
 alias e find-file $1
+alias upall brew update; brew upgrade; brew cleanup