docs: update readme

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Test Results

  2 files    9 suites   1m 1s ⏱️
478 tests 478 ✅ 0 💤 0 ❌
947 runs  947 ✅ 0 💤 0 ❌

Results for commit cc24f5a.

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Performance Benchmark Report

Benchmark name	Baseline (μs)	Test/PR (μs)	Delta (μs)	Delta %
expand_one_string	3.42 μs	3.42 μs	0.00 μs	⚪ Unchanged
instantiate_shell	59.83 μs	59.73 μs	-0.10 μs	⚪ Unchanged
instantiate_shell_with_init_scripts	30341.73 μs	30393.49 μs	51.77 μs	⚪ Unchanged
parse_bash_completion	2757.44 μs	2729.70 μs	-27.73 μs	⚪ Unchanged
parse_sample_script	4.17 μs	4.16 μs	-0.01 μs	⚪ Unchanged
run_echo_builtin_command	89.83 μs	90.08 μs	0.25 μs	⚪ Unchanged
run_one_builtin_command	109.46 μs	108.46 μs	-1.00 μs	⚪ Unchanged
run_one_external_command	1976.33 μs	2054.76 μs	78.42 μs	⚪ Unchanged
run_one_external_command_directly	1002.19 μs	1006.53 μs	4.34 μs	⚪ Unchanged

Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
brush-core/src/shell.rs	🟢 77.97%	🟢 78.54%	🟢 0.57%
brush-shell/src/main.rs	🟢 90.2%	🟢 90.85%	🟢 0.65%
Overall Coverage	🟢 73.41%	🟢 73.44%	🟢 0.03%

Minimum allowed coverage is 70%, this run produced 73.44%