chore(changelog): use 'keep a changelog' format #5997

Job	Run time
Check formatting	16s
Run cargo-deny on Android	25s
Check for typos	10s
Run cargo-deny on iOS	21s
Run cargo-deny on Linux	22s
Test stable Windows 64bit MSVC	1m 45s
Run cargo-deny on macOS	23s
Test stable Windows 32bit MSVC	1m 52s
Run cargo-deny on Redox OS	23s
Test stable Windows 64bit GNU	2m 2s
Run cargo-deny on web	21s
Test stable Windows 32bit GNU	2m 14s
Run cargo-deny on Windows	22s
Test stable Linux 32bit	2m 33s
Test stable Linux 64bit	1m 58s
Test stable X11	1m 41s
Test stable Wayland	1m 39s
Test stable Android	1m 4s
Test stable Redox OS	26s
Test stable macOS	2m 40s
Test stable iOS x86_64	2m 11s
Test stable iOS Aarch64	1m 24s
Test stable web	1m 24s
Test nightly Windows 64bit MSVC	1m 29s
Test nightly Windows 32bit MSVC	1m 37s
Test nightly Windows 64bit GNU	2m 7s
Test nightly Windows 32bit GNU	2m 9s
Test nightly Linux 32bit	2m 8s
Test nightly Linux 64bit	1m 51s
Test nightly X11	1m 52s
Test nightly Wayland	1m 50s
Test nightly Android	1m 5s
Test nightly Redox OS	31s
Test nightly macOS	2m 30s
Test nightly iOS x86_64	1m 29s
Test nightly iOS Aarch64	1m 23s
Test nightly web	1m 5s
Test 1.70.0 Windows 64bit MSVC	52s
Test 1.70.0 Windows 32bit MSVC	1m 5s
Test 1.70.0 Windows 64bit GNU	1m 23s
Test 1.70.0 Windows 32bit GNU	1m 24s
Test 1.70.0 Linux 32bit	1m 25s
Test 1.70.0 Linux 64bit	1m 4s
Test 1.70.0 X11	56s
Test 1.70.0 Wayland	1m 3s
Test 1.70.0 Redox OS	24s
Test 1.70.0 macOS	2m 5s
Test 1.70.0 iOS x86_64	1m 27s
Test 1.70.0 iOS Aarch64	49s
Test 1.70.0 web	42s
Test 1.70.0 Android	58s
Test nightly web Atomic	1m 15s
	1h 7m 54s

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