Pennylane-cirq

New features since last release

* Added a new mixedsimulator class to Cirq, which uses Cirq's
DensityMatrixSimulator as a backend.
[27](https://github.com/XanaduAI/pennylane-cirq/pull/27)

Documentation

* Redesigned the documentation to be consistent with other plugins.
[25](https://github.com/XanaduAI/pennylane-cirq/pull/25)

Bug fixes

* Renamed probability to ``analytic_probability`` to support new
changes in PennyLane.
[24](https://github.com/XanaduAI/pennylane-cirq/pull/24)

Contributors

This release contains contributions from (in alphabetical order):

Theodor Isacsson, Nathan Killoran, Maria Schuld, Antal Száva

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Improvements

* Ported the `CirqDevice` class to use the new `QubitDevice` base class,
enabling the use of tensor observables.
[19](https://github.com/XanaduAI/pennylane-cirq/pull/19)

* Added support for inverse operations by defining the `.inv()` method
of the `CirqOperation` class which uses the `cirq.inverse` function.
[15](https://github.com/XanaduAI/pennylane-cirq/pull/15)

Bug fixes

* Replaced depreceated Cirq commands.
[19](https://github.com/XanaduAI/pennylane-cirq/pull/19)

* Fix a minor bug introduced into the test suite by the release of Cirq 0.7.0.
[18](https://github.com/XanaduAI/pennylane-cirq/pull/18)

* Fix bugs introduced into the test suite by the release of Cirq 0.6.0.
[13](https://github.com/XanaduAI/pennylane-cirq/pull/13)

Contributors

This release contains contributions from (in alphabetical order):

Johannes Jakob Meyer, Antal Száva

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Initial public release.

Contributors
This release contains contributions from:

Johannes Jakob Meyer