Add `p()` for `Bernoulli` (#1481) #1094

Job	Run time
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	1m 15s
test (macos-latest, x86_64-apple-darwin, stable)	1m 1s
test (windows-latest, x86_64-pc-windows-gnu, stable)	2m 1s
test (windows-latest, x86_64-pc-windows-msvc, beta)	1m 54s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.61.0)	2m 33s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	2m 8s
Check doc	33s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	1m 37s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	2m 7s
test-ios	21s
test-miri	4m 37s
test-no-std	13s
	20m 20s

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