fix plotly_static docs.rs build #33

Job	Run time
Clippy	4m 3s
Rustfmt	15s
Code Coverage	13s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	5m 54s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 14s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 7s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 5s
Build Wasm Examples (basic)	49s
Build Book	3m 20s
semver	52s
Build Examples (3d_charts)	27s
Build Wasm Examples (callback-example)	57s
Build Examples (customization/consistent_static_format_export)	1m 24s
Build Examples (financial_charts)	24s
Build Examples (basic_charts)	34s
Build Examples (custom_controls)	30s
Build Examples (customization/multiple_plots_example)	30s
Build Examples (images)	39s
Build Examples (kaleido)	1m 41s
Build Examples (customization/density_mapbox_example)	27s
Build Examples (themes)	39s
Build Examples (ndarray)	33s
Build Examples (shapes)	29s
Build Examples (subplots)	33s
Build Examples (maps)	43s
Build Examples (statistical_charts)	35s
Build Examples (scientific_charts)	34s
	36m 31s

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