qiboteam/qibo: Qibo 0.1.7-rc0

What's Changed removing requirements by @scarrazza in https://github.com/qiboteam/qibo/pull/484 Using actions v2 by @scarrazza in https://github.com/qiboteam/qibo/pull/485 adding doctest to actions by @scarrazza in https://github.com/qiboteam/qibo/pull/488 Fix error message in distcircuit.py by @mlazzarin in https://github.com/qiboteam/qibo/pull/490 Fix distributed circuit without gates execution by @stavros11 in https://github.com/qiboteam/qibo/pull/491 Remove LEAST_SIGNIFICANT_QUBIT flag by @mlazzarin in https://github.com/qiboteam/qibo/pull/494 adding doctest by @andrea-pasquale in https://github.com/qiboteam/qibo/pull/487 updating docs by @scarrazza in https://github.com/qiboteam/qibo/pull/493 Reduce import qibo time by @stavros11 in https://github.com/qiboteam/qibo/pull/496 Remove custom backend classes by @stavros11 in https://github.com/qiboteam/qibo/pull/500 Fix dtype of CZ matrix by @mlazzarin in https://github.com/qiboteam/qibo/pull/503 Remove some hard-coded np.linalg calls from tests by @mlazzarin in https://github.com/qiboteam/qibo/pull/501 Allow multi-qubit unitaries for qibojit backend by @stavros11 in https://github.com/qiboteam/qibo/pull/499 New Contributors @andrea-pasquale made their first contribution in https://github.com/qiboteam/qibo/pull/487 Full Changelog: https://github.com/qiboteam/qibo/compare/v0.1.6...v0.1.7-rc