perf(bash/bashrc): ignore any commands beginning with Tab character
perf(bash/bashrc): ignore any commands beginning with Tab character

A Tab character can be inserted by pressing CTRL-V followed by the TAB
key. This rarely happens but it's nice to ignore this so as to keep Bash
history clean.

shoichiaizawa/dotfiles,shoichiaizawa/dotfiles,shoichiaizawa/dotfiles