Update reqwest requirement from 0.12 to 0.13 #131

Job	Run time
Rustfmt	14s
semver	52s
Clippy	4m 38s
Code Coverage	11s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 21s
Build Wasm Examples (callback-example)	53s
Build Wasm Examples (basic)	1m 3s
Build Book	3m 48s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 24s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	7m 51s
Build Examples (customization/multiple_plots_example)	35s
Build Examples (maps)	36s
Build Examples (kaleido)	1m 20s
Build Examples (customization/consistent_static_format_export)	1m 43s
Build Examples (custom_controls)	29s
Build Examples (3d_charts)	36s
Build Examples (basic_charts)	39s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 51s
Build Examples (statistical_charts)	33s
Build Examples (customization/density_mapbox_example)	35s
Build Examples (financial_charts)	31s
Build Examples (subplots)	30s
Build Examples (ndarray)	33s
Build Examples (shapes)	33s
Build Examples (scientific_charts)	30s
Build Examples (images)	55s
Build Examples (themes)	37s
	41m 21s

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