What's Changed
* Parallelize unit tests at the test file level. by vengroff in https://github.com/censusdis/censusdis/pull/262
* Add shapefile download support for US. by vengroff in https://github.com/censusdis/censusdis/pull/260
* Add symbol column to `all_datasets`. by vengroff in https://github.com/censusdis/censusdis/pull/261
* Generate symbols for all the monthly data sets. by vengroff in https://github.com/censusdis/censusdis/pull/263
**Full Changelog**: https://github.com/censusdis/censusdis/compare/1.1.5...v1.1.6