Queenbee

[1.7.1](https://github.com/ladybug-tools/queenbee/compare/v1.7.0...v1.7.1) (2020-01-23)


Bug Fixes

* **dag loop:** allow dag loop to be null ([0a5cc01](https://github.com/ladybug-tools/queenbee/commit/0a5cc01de024f4199c438c1514a7e9212eb55af4))

[1.7.0](https://github.com/ladybug-tools/queenbee/compare/v1.6.7...v1.7.0) (2020-01-19)


Features

* **dag:** add validators for DAG and DAGTask ([0fa1de8](https://github.com/ladybug-tools/queenbee/commit/0fa1de84ec67f051775cdf65f17c380a5842b9c0)), closes [#32](https://github.com/ladybug-tools/queenbee/issues/32)

[1.6.7](https://github.com/ladybug-tools/queenbee/compare/v1.6.6...v1.6.7) (2020-01-18)


Performance Improvements

* **variable:** improve variable access and validation ([0cd3e8a](https://github.com/ladybug-tools/queenbee/commit/0cd3e8a857c7c938cc99827d5afddf610f001fca)), closes [#12](https://github.com/ladybug-tools/queenbee/issues/12)

[1.6.6](https://github.com/ladybug-tools/queenbee/compare/v1.6.5...v1.6.6) (2020-01-13)


Bug Fixes

* **function:** return null if no inputs are provided ([1be96ba](https://github.com/ladybug-tools/queenbee/commit/1be96ba9d519aa40854d5f0269390199d6e9f1f9))
* **pydantic:** bump to v1.0 ([cbf9cae](https://github.com/ladybug-tools/queenbee/commit/cbf9caede8ceb5bd54347813e2f4cb8df51d8dfc)), closes [#22](https://github.com/ladybug-tools/queenbee/issues/22)

[1.6.5](https://github.com/ladybug-tools/queenbee/compare/v1.6.4...v1.6.5) (2020-01-08)


Bug Fixes

* **docs:** add pip install ([7c90707](https://github.com/ladybug-tools/queenbee/commit/7c90707c9509dc4141af724852165de56f8ffcb9))

[1.6.4](https://github.com/ladybug-tools/queenbee/compare/v1.6.3...v1.6.4) (2020-01-07)


Bug Fixes

* **function:** support integer inputs ([5e6f787](https://github.com/ladybug-tools/queenbee/commit/5e6f7870a2a19ed8fa31f46fbbf46db1e8bf84c3))