Include merge commits in contributor history

[rimutaka]

Only direct commits (1 parent) are assigned to contributors by including the files affected by the commit as contributions. A maintainer doing the hard work of merging PRs would get no credit, which is not right.

Also there is a committer and an author and they are not always the same as in this example: https://github.com/openssl/openssl/commit/690a2b1fa2c8a7dba0be84dfc052d86b864bedc3

Solution 1

Assign all merged commits to the merging contributor.

This should work fine in small to medium size projects. Larger projects may have a maintainer who is not directly involved in writing code and relies on code reviews by others.