v1.1.0

• --help now includes --list command
• --unset option is introduced #26
• several bug fixes includes
  • envchain --list without namespace contains duplicate entries · Issue #24 · sorah/envchain
    • Fix the callback of qsort by k0kubun · Pull Request #27 · sorah/envchain
  • Do not print value of prompt selector flag to stdout by kaorimatz · Pull Request #29 · sorah/envchain