otp was causing an error in readme.rst

remove coveralls again, still not working, now I remember why..

hot fix4: wtf.. isort also dumped 3.7.. and no major version update..…

… jeez..

implement valhalla's trace_attributes (#73)

* WIP

* finish trace_attributes

* fix up review comments

* add isort to pre-commit

* add isort to pre-commit

bump version

add interval_type to isochrone and expansions objects (#72)

* fixes #70; OSRM does have a weird URL concept for profiles, so revert [#64](#64)

* update dependencies

* add  to  objects

* also add 'interval_type' prop to 'Expansions'

* typos

fix last commit: valhalla's matrix wasn't parsing distance properly

Valhalla's 'matrix' endpoint couldn't deal with NULL entries

changelog and readme

add a config for readthedocs; hard-code version in docs/conf.py, no i…

…dea how to do it dynamically