Package Manager is important for ecosystem of development.

• Version control.
• Package management such as installation, uninstallation.

The following items are postponed to V1.2.0.
See #338 for details.

• Dependency control
• Update to the latest version based on a dependency.

The remaining tasks to release V1.1.0 are as follows.

• Support all functionalities.
  • Installation.
  • Uninstallation.
  • Listing packages & versions.
• Misc
  • Update README.md
  • Update ChangeLog.md and ChangeLog_v1.1.x.md