Release v0.3.0

Updates

• Added ability to query a command tree's parent.

Release v0.2.0

Code refactored and features added

Command hierarchy now includes "nodes", which may be commands or trees.
Tree.Lookup now returns a node instead of a command.
Command and tree descriptor types introduced for creating commands and trees.
Command shortcuts inserted in lexicographically sorted order.
Renamed Tree.DisplayHelp to Tree.GetHelp
Introduced new Tree.DisplayHelp and Command.DisplayHelp
Added Tree.AddSubtree
Added Tree.LookupCommand
Added Tree.LookupSubtree
Add Autocomplete function

Release v0.1.1

Update go.mod go directive to use 1.13