Update CHANGELOG for v0.20.5 release #1788

Job	Run time
Generate semantic release version using git-describe-semver	8s
Build stable Alpine x64 image using Makefile	54s
Build oldstable Alpine x86 image using Makefile	58s
Build stable Alpine x86 image using Makefile	55s
Build oldstable Alpine x64 image using Makefile	53s
Build stable image using Makefile	1m 30s
Build unstable Alpine x64 image using Makefile	52s
Build unstable Alpine x86 image using Makefile	1m 8s
Build oldstable cgo-mingw-w64 x86 image using Makefile	1m 52s
Build oldstable cgo-mingw-w64 x64 image using Makefile	1m 29s
Build oldstable image using Makefile	1m 35s
Build stable cgo-mingw-w64 x64 image using Makefile	1m 24s
Build stable cgo-mingw-w64 x86 image using Makefile	1m 58s
Build stable mirror images using Makefile	31s
Build unstable cgo-mingw-w64 x64 image using Makefile	1m 32s
Build unstable cgo-mingw-w64 x86 image using Makefile	1m 31s
Build unstable image using Makefile	1m 31s
	20m 41s

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