Make danger pick reviewers and maintainers at random, for feontend,
backend, database, etc, changes, whenever files belonging to those
teams get changed.
Danger apparently has three different objects which could contain files
you often want to check:
- git.added_files
- git.modified_files
- git.renamed_files
The problem: If a file is renamed, `modified_files` contains the file
path before the rename. In some Danger checks we use `added_files` +
`modified_files`, which might contain the deleted paths of renamed
files, but missing the new paths of renamed files.
So we need to consider `renamed_files` as well.
