Covjsonkit

What's Changed
* Feature/update vp by awarde96 in https://github.com/ecmwf/covjsonkit/pull/37
* Refactor walk_tree to no longer depend on order of polytope tree by awarde96 in https://github.com/ecmwf/covjsonkit/pull/38
* Develop by awarde96 in https://github.com/ecmwf/covjsonkit/pull/39


**Full Changelog**: https://github.com/ecmwf/covjsonkit/compare/0.0.19...0.0.20

What's Changed
* Fix to_xarray for timeseries, remove dummy values by awarde96 in https://github.com/ecmwf/covjsonkit/pull/36


**Full Changelog**: https://github.com/ecmwf/covjsonkit/compare/0.0.18...0.0.19

What's Changed
* Update manifest to include requirements file by awarde96 in https://github.com/ecmwf/covjsonkit/pull/35


**Full Changelog**: https://github.com/ecmwf/covjsonkit/compare/0.0.17...0.0.18

What's Changed
* Edit requirements file by awarde96 in https://github.com/ecmwf/covjsonkit/pull/34


**Full Changelog**: https://github.com/ecmwf/covjsonkit/compare/0.0.16...0.0.17

What's Changed
* Develop by awarde96 in https://github.com/ecmwf/covjsonkit/pull/33
* Update manifest to include data files, add install_requires to setup.py


**Full Changelog**: https://github.com/ecmwf/covjsonkit/compare/0.0.15...0.0.16

What's Changed
* Add config support to set param db by awarde96 in https://github.com/ecmwf/covjsonkit/pull/30
* Feature/update vertical profile by awarde96 in https://github.com/ecmwf/covjsonkit/pull/31
* Develop by awarde96 in https://github.com/ecmwf/covjsonkit/pull/32


**Full Changelog**: https://github.com/ecmwf/covjsonkit/compare/0.0.14...0.0.15