Numerically approximate ellipse perimeter (#383) #664

Job	Run time
cargo test (windows-latest)	41s
cargo test (macos-latest)	22s
cargo test (ubuntu-latest)	18s
cargo check (msrv) (wasm32)	18s
cargo check (msrv) (windows-latest)	46s
cargo clippy (windows-latest)	1m 13s
cargo check (msrv) (macos-latest)	34s
cargo check (msrv) (ubuntu-latest)	19s
cargo clippy (macos-latest)	38s
cargo clippy (wasm32)	42s
cargo clippy (ubuntu-latest)	49s
cargo fmt	25s
cargo test (wasm32)	16s
typos	5s
cargo doc	30s
	7m 56s

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