Consider supporting .github directory for DEREK.yaml about derek

[jhillyerd]

Turns out at least two other bots use .github for their config:

• probot: https://probot.github.io/apps/settings/
• tailor: https://github.com/coreos/tailor/blob/master/README.md

[alexellis]

I see the point about projects collecting files in their root such as .travis.yml, Dockerfile and the likes.

At the moment convention over configuration means the project's code-base can remain simple.

There are lots of different integrations which have a file in the root of a repo - this does also give better visibility to the project which is provided for free. Example of the Docker project and some of the bots they use - https://github.com/moby/moby

While it is a valid point, I don't see a pressing need for this change. Thanks for logging the suggestion - I'll mark it for revisiting at a later date.