README.md: link to RFE about systemd-homed fscrypt version support (#… #255

Job	Run time
Generate, format, and lint	57s
Build (Go 1.18)	40s
Build (32-bit)	54s
Build (Go 1.19)	42s
Run command-line interface tests	1m 3s
Run integration tests	53s
Build (Go 1.20)	37s
	5m 46s

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