chore: release 1.11.0 (#17)
:robot: I have created a release \*beep\* \*boop\*
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## [1.11.0](https://www.github.com/googleapis/python-datastore/compare/v1.10.0...v1.11.0) (2020-02-27)
### Features
* **datastore:** add return query object in add filter method ([#12](https://www.github.com/googleapis/python-datastore/issues/12)) ([6a9efab](https://www.github.com/googleapis/python-datastore/commit/6a9efabe1560d5137986df70f1b4f79731deac02))
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