README.txt: http://flam3.com/flame.pdf is broken link

[thomasrussellmurphy]

The link http://flam3.com/flame.pdf provided in README.txt returns a not-found error page.

[seanjensengrey]

https://web.archive.org/web/20181020070628/http://flam3.com/flame.pdf

[PeterBBBBB]

Its been renamed to https://flam3.com/flame_draves.pdf