docs(README): mention immediate: false explicitly, improve formatting

[JuroUhlar]

No description provided.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	91.87%	192/209
🟢	Branches	82.14%	46/56
🟡	Functions	71.7%	38/53
🟢	Lines	91.94%	171/186

Test suite run success

19 tests passing in 5 suites.

Report generated by 🧪jest coverage report action from a24d9fd

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St	File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
🟢	All files	91.86	82.14	71.69	91.93
🟢	src	94.33	90.9	60	93.61
🟢	detect-env.ts	92.3	86.66	100	91.3	15,85
🟢	env.ts	100	100	100	100
🟢	env.types.ts	100	100	100	100
🟡	fpjs-context.ts	80	100	0	80	38
🟡	get-env.ts	75	0	100	75	9-10
🟢	index.ts	100	100	0	100
🟢	ssr.ts	100	100	100	100
🟢	use-visitor-data.ts	97.72	100	87.5	97.29	79
🟢	src/components	90.66	75	86.66	92.75
🟢	fpjs-provider.tsx	88.52	69.23	83.33	91.22	112,118-123,142-144
🟢	with-environment.tsx	100	100	100	100
🟢	src/utils	85.71	57.14	87.5	82.6
🟡	assert-is-truthy.ts	66.66	0	100	66.66	3
🟡	to-error.ts	75	100	100	75	6
🟢	use-previous.ts	100	100	100	100
🟢	wait-until.ts	86.66	60	75	80	10-12

[github-actions]

This PR will create a patch release 🚀

2.6.4 (2024-05-27)

Documentation

• README: mention immediate: false explicitly, improve formatting (f1d03e2)