Tests

Add WeightedIndex::update_weights_relative #706

Job	Run time
Check doc	1m 7s
test-ios	24s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	2m 17s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	1m 0s
test (macos-latest, x86_64-apple-darwin, stable)	1m 24s
test-miri	2m 14s
test-no-std	14s
test (windows-latest, x86_64-pc-windows-gnu, stable)	2m 8s
test (windows-latest, x86_64-pc-windows-msvc, beta)	1m 48s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.60.0)	4m 39s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	1m 50s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	33s
	19m 38s

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