README.md: Update note about `jj resolve` #360

Job	Run time
Check formatting	15s
Check that webapp was compiled	15s
test (ubuntu-latest)	46s
clippy	1m 47s
test (macos-13)	1m 17s
test (macos-14)	42s
test (windows-latest)	1m 49s
test (ubuntu-latest, --all-features)	47s
	7m 38s

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