Version 0.3 (2018-09-07)
* Allow inputs to be directories as well as files
* Deal gracefully with unreadable source files (e.g. py3 files in a py2 tree)

Version 0.2.1 (2018-08-16)
* Add pytype and travis integration
* Make all tests 2-and-3 compatible

Version 0.2 (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
