Release v2.8.0 #737

Job	Run time
spellcheck	13s
Linux build test (gcc, g++, ON)	1m 10s
Linux build test (gcc, g++, OFF)	57s
FreeBSD-amd64	8m 35s
Linux build test (clang, clang++, ON)	1m 3s
Linux-aarch64	10m 32s
Linux-amd64	2m 48s
Linux build test (clang, clang++, OFF)	1m 16s
Linux-old-amd64	3m 3s
Linux build test (musl-gcc, musl-g++, OFF)	56s
macOS-universal	8m 32s
Windows-amd64	2m 22s
Windows-i686	7m 41s
Release	0s
	49m 8s

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