Please add a git config option to make --show-signature the default

[Austin English <austinenglish@xxxxxxxxx>]

As stated in title, I'd like to see an option to enable GPG signature
by default. I find this feature very useful and would like to enable
it by default on my machine, without having to resort to an alias in
my ~/.bash_rc.

I asked in #git and checked the git repo, but I didn't see an option
listed for this.

Thanks in advance, and for git itself! ;)
-Austin

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