Checking in changes prior to tagging of version v0.10.1

v0.10.1 (2019-04-27)

• Remove panics #130 (Songmu)
• generally loggers should output STDERR by default #129 (Songmu)
• Care the case if the query contains a hostname in list subcommand #128 (Songmu)
• don't panic when the current working directory doesn't exist. #127 (Songmu)
• canonicalize root paths to absolute #126 (Songmu)
• List symlinks to repos #125 (Songmu)
• rename package s/utils/cmdutil/ #124 (Songmu)
• separate logger package from utils #123 (Songmu)