2019-01-20 (tag: v2.19.0120)

LICENSE.md: Explicitly PUBLIC DOMAIN:
https://creativecommons.org/publicdomain/zero/1.0/
Link to LICENSE.md for the bottom image.

Add .github/CODE_OF_CONDUCT.md

README.md: Add site banner image, and
sync with upstream.

2017-08-04 (tag: v2.17.0804)

v2 is a true divergent fork from v1.

Renamed: readme.md -> README.md

Renamed: contributing.md -> .github/CONTRIBUTING.md

Revise self-reference links.

2017-08-03 (tag: v1.17.0803)

Exactly in sync with https://github.com/antontarasenko/awesome-economics