Update CHANGELOG for v0.20.8 release #1859

Job	Run time
Generate semantic release version using git-describe-semver	5s
Build oldstable Alpine x64 image using Makefile	56s
Build stable Alpine x64 image using Makefile	53s
Build oldstable cgo-mingw-w64 x64 image using Makefile	1m 33s
Build oldstable Alpine x86 image using Makefile	57s
Build oldstable cgo-mingw-w64 x86 image using Makefile	1m 33s
Build stable Alpine x86 image using Makefile	59s
Build stable cgo-mingw-w64 x64 image using Makefile	1m 34s
Build stable cgo-mingw-w64 x86 image using Makefile	2m 7s
Build stable image using Makefile	1m 26s
Build unstable Alpine x64 image using Makefile	53s
Build unstable Alpine x86 image using Makefile	58s
Build unstable cgo-mingw-w64 x64 image using Makefile	1m 32s
Build unstable cgo-mingw-w64 x86 image using Makefile	2m 5s
Build oldstable image using Makefile	1m 37s
Build stable mirror images using Makefile	35s
Build unstable image using Makefile	1m 30s
	21m 13s

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