Fix backtick in readme

[reubeno]

No description provided.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (ns)	Test/PR (ns)	Delta (ns)	Delta %
expand_one_string	3318 ns	3318 ns	0 ns	⚪ 0.00%
instantiate_shell	52084 ns	52526 ns	+442 ns	🟠 +0.85%
instantiate_shell_with_init_scripts	47075035 ns	46938978 ns	-136057 ns	🟢 -0.29%
parse_bash_completion	6634704 ns	6610152 ns	-24552 ns	🟢 -0.37%
parse_sample_script	10974 ns	10953 ns	-21 ns	🟢 -0.19%
run_echo_builtin_command	91356 ns	91837 ns	+481 ns	🟠 +0.53%
run_one_builtin_command	108697 ns	108709 ns	+12 ns	🟠 +0.01%
run_one_external_command	1784018 ns	1782814 ns	-1204 ns	🟢 -0.07%
run_one_external_command_directly	1024934 ns	1021107 ns	-3827 ns	🟢 -0.37%

Code Coverage Report

Package	Base Coverage	New Coverage	Difference
cli.src	🟠 73.95%	🟠 73.95%	⚪ 0%
interactive-shell.src	🟢 75.88%	🟢 75.88%	⚪ 0%
parser.src	🟢 85.86%	🟢 85.86%	⚪ 0%
shell.src	🟢 79.98%	🟢 79.98%	⚪ 0%
shell.src.builtins	🟠 64.03%	🟠 64.03%	⚪ 0%
Overall Coverage	🟢 78.02%	🟢 78.02%	⚪ 0%

Minimum allowed coverage is 0%, this run produced 78.02%