Introduce `convert_unit` (#255) · qutip/QuantumToolbox.jl@51684ab

removing `stable` and linking `stable` to `v0.16.0`.

removing `v0.16` and linking `v0.16` to `v0.16.0`.

removing `v0.15` and linking `v0.15` to `v0.15.0`.

removing `v0.14` and linking `v0.14` to `v0.14.1`.

removing `v0.13` and linking `v0.13` to `v0.13.1`.

removing `v0.12` and linking `v0.12` to `v0.12.1`.

removing `v0.11` and linking `v0.11` to `v0.11.4`.

removing `v0.10` and linking `v0.10` to `v0.10.2`.

removing `v0.9` and linking `v0.9` to `v0.9.1`.

removing `v0.8` and linking `v0.8` to `v0.8.4`.

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