Add changelog deprecation notice (#907) #11

Job	Run time
MinSRV	1m 21s
Code Coverage (ubuntu-latest)	2m 29s
Build (ubuntu-latest, arm-unknown-linux-gnueabihf, use-cross)	6m 12s
Style (ubuntu-latest)	4m 18s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, use-cross)	5m 10s
Style (macos-latest)	5m 24s
Build (ubuntu-latest, aarch64-unknown-linux-musl, use-cross)	5m 24s
Style (windows-latest)	6m 18s
Build (ubuntu-latest, i686-unknown-linux-gnu, use-cross)	5m 2s
Build (ubuntu-latest, i686-unknown-linux-musl, use-cross)	6m 37s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, use-cross)	5m 22s
Build (ubuntu-latest, x86_64-unknown-linux-musl, use-cross)	6m 29s
Build (macos-latest, x86_64-apple-darwin)	4m 51s
Build (macos-latest, aarch64-apple-darwin)	5m 22s
Build (windows-latest, i686-pc-windows-gnu)	8m 57s
Build (windows-latest, i686-pc-windows-msvc)	10m 10s
Build (windows-latest, x86_64-pc-windows-gnu)	12m 48s
Build (windows-latest, x86_64-pc-windows-msvc)	9m 12s
	1h 51m 26s

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