rand_jitter v0.4, platform_ns_time feature, MSRV=1.51, rustfmt #67

Job	Run time
MSRV for rand_jitter	3m 50s
Check doc	1m 10s
MSRV for rand_isaac / rand_xorshift / rand_xoshiro	3m 55s
MSRV for rand_hc	2m 56s
test-cross (powerpc-unknown-linux-gnu, stable)	51s
test-miri	1m 22s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	26s
test (macos-latest, x86_64-apple-darwin, stable)	1m 4s
test (windows-latest, x86_64-pc-windows-gnu, stable)	1m 1s
test (windows-latest, x86_64-pc-windows-msvc, beta)	59s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	59s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	43s
	19m 16s

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