Update badge link to use 'main' branch #125

Job	Run time
build (darwin, arm64, macos-arm64)	30s
build (linux, arm64, linux-arm64)	27s
build (darwin, amd64, macos-amd64)	30s
build (windows, 386, windows-386, .exe)	29s
build (windows, amd64, windows-amd64, .exe)	35s
build (linux, arm, linux-arm)	22s
build (linux, amd64, linux-amd64)	35s
build (freebsd, arm64, freebsd-arm64)	29s
build (linux, 386, linux-386)	29s
build (freebsd, amd64, freebsd-amd64)	33s
release	0s
	4m 59s

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