make Plot::default() behave like Plot::new() #141

Job	Run time
Code Coverage	12s
Build Wasm Examples (basic)	1m 6s
Build Book	3m 52s
Build Wasm Examples (callback-example)	51s
Rustfmt	17s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 19s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	6m 43s
semver	38s
Clippy	4m 35s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 23s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	4m 20s
Build Examples (kaleido)	1m 42s
Build Examples (financial_charts)	27s
Build Examples (themes)	39s
Build Examples (custom_controls)	27s
Build Examples (customization/multiple_plots_example)	33s
Build Examples (customization/consistent_static_format_export)	1m 32s
Build Examples (statistical_charts)	34s
Build Examples (3d_charts)	27s
Build Examples (ndarray)	1m 37s
Build Examples (images)	1m 11s
Build Examples (maps)	36s
Build Examples (shapes)	35s
Build Examples (basic_charts)	1m 2s
Build Examples (scientific_charts)	25s
Build Examples (customization/density_mapbox_example)	34s
Build Examples (subplots)	36s
	42m 13s

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