Version 0.2.1 (2018-06-06)
* Track file provenance for all imports
* Don't allow relative imports in non-packages

Version 0.1.1 (2018-05-14)
* Import graph with cycle detection and topological sorting
* Add a broken dependency checker
* Importlab works under python 2.7 and python 3.5+
* Invoke python to resolve imports from site packages
* Remove dependencies on pytype and typeshed

Version 0.1 (2017-11-17)
* Initial import
