[stats/MERGE/stats] Rename "stats" -> "committer-stats"

[John Arbash Meinel]

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Jelmer Vernooij wrote:
| Hi John,
|
| The attached trivial patch renames the stats command to committer-stats
| and adds "stats" as an alias for that with the idea that in the future
| "stats" could be a separate command that prints more than just the
| committer stats but other stats as well.
|
| Cheers,
|
| Jelmer
|

not-really-BB: approve

I don't have super strong feelings about the plugin. It was something I wrote
once to be useful, so I have no problem with it evolving.

John
=:->
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