Doc link from readme not working anymore

[Systerr]

http://olado.github.com/doT that link generates 404 instead of documentation

[MikeRalphson]

I believe doT is unmaintained, but for reference this link works: https://olado.github.io/doT/

[epoberezkin]

doT is a stable piece of software that should be used when performance is critical. There is nothing to maintain, really.

[epoberezkin]

The link needs to be replaced