qiskit/releasenotes/notes/0.15/remove-deprecated-qi-b7d5a8...

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---
upgrade:
- |
All classes and function in the ``qiskit.tool.qi`` module were deprecated
in the 0.12.0 release and have now been removed. Instead use the
:mod:`qiskit.quantum_info` module and the new methods and classes that
it has for working with quantum states and operators.
- |
The ``qiskit.quantum_info.basis_state`` and
``qiskit.quantum_info.projector`` functions are deprecated as of
Qiskit Terra 0.12.0 as are now removed. Use the
:class:`qiskit.quantum_info.QuantumState` and its derivatives
:class:`qiskit.quantum_info.Statevector` and
:class:`qiskit.quantum_info.DensityMatrix` to work with states.