Multihist

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* 'model' option for error bars, showing Poisson quantiles (14)
* Fix vmin/vmax for matplotlib >3.3, resume CI tests (15)
* Hist1d.data_for_plot returns numbers used in error calculation

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* Prevent object array creation (12)

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* Feldman-Cousins errors for Hist1d.plot (10)

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* Fix rebinning for empty histograms (9)

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* Fixes for 7 (8)

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* Correct step plotting at edges, other plotting fixes
* Histogram numpy structured arrays
* Fix deprecation warnings (6)
* `lookup_hist`
* `.max()` and `.min()` methods
* percentile support for higher-dimensional histograms
* Improve Hist1d.get_random (also randomize in bin)

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