Ability to set default options

It would be nice to be able set the default options.

For now I've created a git alias

zsh:

git config --global alias.tree "\!gitree -m -c"

./git/config file:

[alias]
	tree = "!gitree -m -c"

Usage:

I'll be harsh and say that the git alias you've created is probably the best way to do this!

A really nice little snippet to have though; I'll use to issue to make sure that it's added to the README.md for other users. <3

It's not harsh at all :) I thought I'd leave an issue in any case so that other people can see it's an option.

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