Update git-authors - remove "WHERE"

[izikeros]

Having "WHERE" in:

git log --pretty=format:'%an <%ae>' "$WHERE" | sort | uniq -c | sort -nr

was breaking the command. "WHERE" was removed, what fixes the command.

[codeclimate]

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[unixorn]

Without $WHERE, you'll always get the authors for the entire repository. With it, you can get just the authors in a given directory tree, and we're currently defaulting to the current directory.

I think making the default value of $WHERE be the root of the git checkout is a reasonable compromise though. You can find that with git rev-parse --show-toplevel.

[izikeros]

Please close this PR (without merging), there is no issue with $WHERE - I was using it wrong way. Sorry for the confusion.

[unixorn]

Closing as requested - #683 was user error