bump rand_distr and remove obsolete small_rng features #148

Job	Run time
Code Coverage	13s
Rustfmt	17s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 25s
Clippy	4m 10s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	7m 6s
semver	45s
Build Book	3m 45s
Build Examples (scientific_charts)	23s
Build Wasm Examples (basic)	46s
Build Examples (customization/multiple_plots_example)	36s
Build Examples (custom_controls)	29s
Build Examples (subplots)	27s
Build Examples (3d_charts)	33s
Build Examples (kaleido)	1m 16s
Build Wasm Examples (callback-example)	48s
Build Examples (shapes)	26s
Build Examples (customization/density_mapbox_example)	31s
Build Examples (themes)	25s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	7m 26s
Build Examples (customization/consistent_static_format_export)	1m 42s
Build Examples (maps)	37s
Build Examples (images)	47s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 2s
Build Examples (ndarray)	34s
Build Examples (basic_charts)	35s
Build Examples (financial_charts)	26s
Build Examples (statistical_charts)	26s
	41m 56s

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