* force mistune to version 0.8.4 (#43)

closes #42 
closes #40

* pin

* Remove calls to ErrorString and SafeString removed in docutils 0.19 (#49)

* remove python2

* fix pipelines

* fix linter pipeline

* set language for sphinx

* fix tests pipeline

* fix pipeline, set docutiles dependency

* why did I change this

* bump

Co-authored-by: Ezequiel Rosas <nhtzr.rg@gmail.com>
Co-authored-by: Ian Glen <ian@ianglen.me>