Prepare for `cargo publish` - #6

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bddap wants to merge 3 commits into

plotters-rs:masterfrom

Commits on Nov 5, 2021

run 'cargo upgrade' to update dependencies
bddap
committed
351588e
bump version from 0.3.0 to 0.4.0 in preparation of a cargo publish
bddap
committed
e22dbc6
implement changes suggested by cargo check --example
bddap
committed
2feeeb0