Add changelog for 0.17.16 (#570) #687

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Job	Run time
powerpc_cross	4m 6s
rustfmt	8s
feature_check (ubuntu-latest)	22s
build (1.65.0, ubuntu-latest)	1m 55s
feature_check (macos-latest)	25s
test_all (ubuntu-latest)	3m 16s
build (1.65.0, windows-latest)	2m 45s
feature_check (unstable, ubuntu-latest)	24s
test_all (macos-latest)	2m 14s
build (1.65.0, macos-latest)	1m 52s
feature_check (unstable, macos-latest)	25s
build (stable, ubuntu-latest)	5s
feature_check (benchmarks, ubuntu-latest)	23s
build (stable, windows-latest)	1m 4s
feature_check (benchmarks, macos-latest)	24s
build (stable, macos-latest)	10s
build (beta, ubuntu-latest)	16s
build (beta, windows-latest)	38s
build (beta, macos-latest)	17s
build (nightly, ubuntu-latest)	13s
build (nightly, windows-latest)	27s
build (nightly, macos-latest)	16s
	22m 5s

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