0.2.0

New Features

• Adds the get_qubit method to the Circuit class allowing for the retrieval of qubits in the circuit by label.

  circuit = Circuit()
  circuit.add_qubit(Qubit("my_qubit"))
  
  qubit = circuit.get_qubit("my_qubit")

• Add support for mid-circuit measurements.

• Add support for operations conditioned on measurements.

• Add support for measurement sampling and expectation value calculations.

• Circuit context returns the classical register together with QuantumRegister. The two
  registers are contained within a tuple and are returned as with circuit.context as (q, c),
  instead of with circuit.context as q.

  circuit = Circuit(2, 2)
  
  with circuit.context as (q, c):
      ops.X(q[0])

• Add a Windows executable makefile (make.bat)

• Add make docs and make clean-docs commands to the makefile for building and
  cleaning/removing the documentation locally.

Upgrade Notes

• Update context to return a NamedTuple instead of a regular tuple, allowing for the registers
  to be returned as previously, directly unpacked into q and c, or as a named Registers
  tuple and retrieved via Registers.q and Registers.c respectively.

• Update parametric context to return a NamedTuple instead of a regular tuple similar to the
  non-parametric context upgrade, with the parameter register accessed via Registers.p.

  circuit = ParametricCircuit(2, 2)
  
  with circuit.context as reg:
      ops.RX(reg.p[0], reg.q[0])

• Check types when adding qubits/bits to a circuit and raise a TypeError if an incorrect type
  is passed to the method.

• Rename label to name for operations.

Bug Fixes

• Fixes an issue where an error is being raised when subsequent measurements are made on the same
  qubit. Instead, any subsequent measurement will replace the former one at simulation runtime.

• Fix inconsistent spacing in primitive object representations.

• Fix sequential qubit/bit labelling when adding new registers.

• Update operation representations to use repr() for hashables.

• Adds pip installation step to make install command.

• Expand installation section in the README to include installation on Windows (using
  make.bat) and add details to installation steps.