Update CONFIGURATION.md

[5shekel]

correct bash configuration switch

130 mc@nether:~$ hstr --show-bash-configuration >> ~/.bashrc
hstr: unrecognized option '--show-bash-configuration'
mc@nether:~$ hstr --help
Usage: hstr [option] [arg1] [arg2]...
Shell history suggest box:

  --favorites              -f ... show favorites view
  --kill-last-command      -k ... delete last command in history
  --non-interactive        -n ... print filtered history and exit
  --show-configuration     -s ... show configuration to be added to ~/.bashrc
  --show-zsh-configuration -z ... show zsh configuration to be added to ~/.zshrc
  --show-blacklist         -b ... show commands to skip on history indexation
  --insert-in-terminal=[c] -i ... insert command c in terminal prompt and exit
  --version                -V ... show version details
  --help                   -h ... help