v0.8.5

Yao v0.8.5

Diff since v0.8.4

Closed issues:

• How can we compute the hessian matrix (#425)
• Retrieving a Unitary from a circuit (#429)
• Kron and chain (#430)
• Implementing circuit.append(cirq.X(qubits[3]).controlled_by(qubits[1],qubits[4])) (#431)
• Extending Blocks to include timing information of a quantum gate (#434)
• variational_circuit not matched (#436)
• label not found (#438)

Merged pull requests:

• Bumped compat for DocStringExtensions (#428) (@jlbosse)
• fix warnings of unused type params (#433) (@Roger-luo)