Update README and macro docs #4

Job	Run time
Doc	20s
Format	13s
Cross / i686-unknown-linux-gnu	1m 4s
Clippy	14s
Cross / i586-unknown-linux-gnu	1m 14s
Cross / armv7-unknown-linux-gnueabihf	1m 6s
Miri /	40s
Miri / --release	37s
Test / x86_64-pc-windows-msvc	55s
Cross / aarch64-unknown-linux-gnu	1m 6s
Toolchain / stable	21s
Test / x86_64-pc-windows-msvc --release	1m 13s
Cross / thumbv6m-none-eabi	1m 13s
Toolchain / stable --release	28s
Toolchain / beta	21s
Toolchain / beta --release	26s
Toolchain / nightly	23s
Toolchain / nightly --release	30s
	12m 24s

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