Merge pull request #250 from Nick-Pearson/fix-book-graphs #338

Job	Run time
Clippy	2m 59s
Build Wasm Examples (wasm-yew-minimal)	49s
Code Coverage	1m 54s
Build Examples (3d_charts)	25s
Rustfmt	12s
Build Examples (basic_charts)	32s
semver	1m 17s
Build Examples (custom_controls)	23s
Tests (ubuntu-latest)	2m 0s
Build Examples (financial_charts)	22s
Tests (windows-latest)	4m 28s
Build Examples (images)	47s
Tests (macos-latest)	2m 38s
Build Examples (kaleido)	1m 18s
Build Examples (maps)	24s
Build Examples (ndarray)	33s
Build Examples (scientific_charts)	36s
Build Examples (shapes)	25s
Build Examples (subplots)	22s
	22m 24s

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