v0.1.2

• Fix printing tab characters. Now default tab width is 4 (can be configured with --tab option).
• Fix exit status is always 0 when no error happens. Grep tool should return non-zero exit status when no match was found.
• Add feature to generate shell completion scripts for Bash, Zsh, Fish, PowerShell, and Elvish. Check --generate-completion-script option.
• Printing results is now much faster. It is 3.3x faster than previous.