Add tesseract support in docker images

[Ganitzsh]

Hi,

Very good work with this project, super userful!

Is it possible to add support for tesseract in the docker images?

Just asking to know if I directly fork it or just wait a bit

Thanks!

[mish15]

happy to accept a PR for that if you want to add it? It should be a pretty small change.

[mish15]

FYI has been added in https://github.com/sajari/docconv/pull/54