v0.5-pre2

• import supports subcommands to list URLs
• [fix] look exits with non-zero when failed @fujimura
• [fix] Accept SCP-like URL for import @mkanai
• [fix] import supports same flags as get @eagletmt
• [feature] root command to show roots thanks to @aaa707
• [feature] zsh completion for root command thanks to @syohex
• Include zsh completion into release archives thanks to @itiut