Overloading `Base.show` about bijectors.jl HOT 7 OPEN

The {..., Dims=1} in Composed. After #44 we'll have dimension information in Bijector, and in the case of these "wrapper" bijectors, e.g. Composed, it could be nice to show the dimensionality of the bijector:)

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I see, I think the dims is a good idea.

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You can see how the README will look with dimensionality from PR #44 combined with the proposed Base.show overload over at https://github.com/torfjelde/Bijectors.jl/tree/tor/show-overload

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How does 1 differ from 2?

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We can also drop the Dims= and just write the dimensionality N, which is similar to what you get by default for all other bijectors, e.g. Exp() is displayed as Exp{0}() because by default we assume Exp to be 0-dimensional (can also instantiate as Exp{N}() where N is an integer)

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Would it make sense to use lower-case dim instead of Dim? I think this would be more julia style.

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I'm not necessarily against that; my reasoning for choosing Dim is because it's a type-parameter rather than an argument. Could also rename to D or dim as you suggested :)

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