Display timestamp, useful to find timing problem #687

Job	Run time
Check lib MSRV (x86_64-unknown-linux-gnu)	48s
Check lib (x86_64-unknown-linux-gnu)	29s
Check lib MSRV (aarch64-unknown-linux-gnu)	1m 33s
Unit Tests (x86_64-unknown-linux-gnu)	25s
Check lib (aarch64-unknown-linux-gnu)	1m 45s
Check (x86_64-apple-darwin)	46s
Unit Tests (aarch64-unknown-linux-gnu)	1m 42s
Check lib MSRV (armv7-unknown-linux-gnueabihf)	1m 24s
Check lib (armv7-unknown-linux-gnueabihf)	1m 10s
Check (x86_64-unknown-linux-gnu)	32s
Check (x86_64-unknown-linux-musl)	30s
Unit Tests (armv7-unknown-linux-gnueabihf)	1m 22s
Check (x86_64-pc-windows-msvc)	1m 17s
Check (aarch64-unknown-linux-gnu)	1m 38s
Rustfmt	8s
Check (armv7-unknown-linux-gnueabihf)	1m 54s
Clippy (x86_64-unknown-linux-gnu)	33s
Clippy (aarch64-unknown-linux-gnu)	1m 53s
Clippy (armv7-unknown-linux-gnueabihf)	2m 17s
	22m 6s

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