Tests

minor doc change #135

Job	Run time
ubuntu-latest w/ bindgen (R-devel rust-stable )	4m 25s
windows-latest (R-release rust-stable-msvc)	12m 58s
macOS-latest w/ bindgen (R-devel rust-stable )	6m 46s
windows-latest (R-devel rust-stable-msvc)	9m 12s
windows-latest w/ bindgen (R-release rust-stable-msvc x86_64-pc-windows-gnu)	5m 58s
windows-latest (R-oldrel rust-stable-msvc)	16m 43s
windows-latest w/ bindgen (R-devel rust-stable-msvc x86_64-pc-windows-gnu)	5m 38s
macOS-latest (R-release rust-stable)	10m 25s
windows-latest w/ bindgen (R-release rust-nightly-msvc x86_64-pc-windows-gnu)	11m 8s
ubuntu-latest (R-release rust-stable)	6m 34s
windows-latest w/ bindgen (R-oldrel rust-nightly-msvc x86_64-pc-windows-gnu)	13m 51s
ubuntu-latest (R-release rust-nightly)	6m 7s
ubuntu-latest (R-devel rust-stable)	6m 41s
ubuntu-latest (R-oldrel rust-stable)	5m 59s
	2h 2m 25s

Provide feedback