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* Do not use fixed-width columns when producing Markdown output.
* The `user:*` syntactic sugar now produces reports for all users who
ever contributed to the repository, instead of collaborators.
* The `user:*` syntactic sugar is expanded to allow specifying a team
name, as in `user:*<team_name>`, to produce reports for all users
belonging to the specified team.
* Four “pseudo-team names” are recognized: `__contributors`,
`__committers`, `__commenters`, and `__collaborators`.