New version: Unitful v1.22.0

[JuliaRegistrator]

• Registering package: Unitful
• Repository: https://github.com/PainterQubits/Unitful.jl
• Created by: @sostock
• Version: v1.22.0
• Commit: e0d6ee375f12ad62e6af1c8387c6ea7dcf480271
• Reviewed by: @sostock
• Reference: PainterQubits/Unitful.jl@e0d6ee3#commitcomment-150861676
• Description: Physical quantities with arbitrary units
• Release notes:

* ![Feature:](https://img.shields.io/badge/-feature-green) `Base.big` can now be used with quantities ([#755](https://github.com/PainterQubits/Unitful.jl/pull/755)).
* ![Bugfix:](https://img.shields.io/badge/-bugfix-purple) Using `Base.convert` to convert to a unitless quantity no longer errors ([#724](https://github.com/PainterQubits/Unitful.jl/pull/724)).
* ![Bugfix:](https://img.shields.io/badge/-bugfix-purple) Using `Base.convert` to convert to a mixed logarithmic quantity no longer returns wrong results. In cases that returned a result even though it was unknown whether the quantity was a power or root-power quantity, an error is thrown instead ([#724](https://github.com/PainterQubits/Unitful.jl/pull/724)).
* ![Enhancement:](https://img.shields.io/badge/-enhancement-blue) `uconvert` now preserves the floating-point precision of quantities ([#754](https://github.com/PainterQubits/Unitful.jl/pull/754)).
* ![Enhancement:](https://img.shields.io/badge/-enhancement-blue) When printing arrays, quantities are now aligned at the decimal point just like unitless numbers ([#752](https://github.com/PainterQubits/Unitful.jl/pull/752)).

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