Add comment about kitty's text_fg_override_threshold #174

Job	Run time
Ensure 'cargo fmt' has been run	14s
Extract crate metadata	6s
aarch64-unknown-linux-gnu (ubuntu-20.04)	2m 21s
Minimum supported rust version	52s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	2m 46s
arm-unknown-linux-musleabihf (ubuntu-20.04)	1m 38s
i686-pc-windows-msvc (windows-2019)	2m 28s
i686-unknown-linux-gnu (ubuntu-20.04)	2m 4s
i686-unknown-linux-musl (ubuntu-20.04)	1m 49s
x86_64-apple-darwin (macos-12)	1m 30s
x86_64-pc-windows-gnu (windows-2019)	7m 48s
x86_64-pc-windows-msvc (windows-2019)	2m 9s
x86_64-unknown-linux-gnu (ubuntu-20.04)	1m 59s
x86_64-unknown-linux-musl (ubuntu-20.04)	1m 29s
Publish to Winget	0s
	29m 13s

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