Fix JB review.

Up version

Up build version.

Fix #30

Fix #30

Fix #30

Added shortcuts by issues #26

# Release: 2.1

*   New feature: Shortcuts and Drag and Drop mode idea by [#26 By ash0080](#26)

    *   Create a new target, default shortcut: ctrl/⌘ ⇧ T
    *   Create a new root task: Shift + enter
    *   Delete current task: ctrl/⌘ ⇧ ⌫
    *   Select previous task: ↑
    *   Select next task: ↓

Fix bug and improve UI.

Refactor code.

issues #27

Release: 2.0.1