Tests

Update CHANGELOGs and prepare rand 0.9.0-alpha.0 (#1395) #688

Job	Run time
Check doc	1m 9s
test-ios	26s
test-no-std	15s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	54s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	1m 26s
test (macos-latest, x86_64-apple-darwin, stable)	1m 29s
test (windows-latest, x86_64-pc-windows-gnu, stable)	2m 52s
test (windows-latest, x86_64-pc-windows-msvc, beta)	1m 46s
test-miri	2m 54s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.60.0)	4m 17s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	1m 40s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	1m 23s
	20m 31s

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